Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f618110a1f072e3…

MALICIOUS

PDF

74.8 KB Created: 2021-04-03 14:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2d038010cef0802de345f1de82279003 SHA-1: cf64bdfaf81d3f8224a7e5ae510e4ba63336b8d6 SHA-256: 5f618110a1f072e3fac6440e9d1081ee964ef7a9f9e310aa062234ffb4118206
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, forming a link farm designed to redirect users to potentially malicious sites, with one URL explicitly pointing to known malicious infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to direct users away from the current document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=how+to+use+kemper+profiler+stage In PDF document text
    • https://cdn.sqhk.co/rivogigaweb/ehjlhh7/lefaluwafujoki.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/Iwghge4/71447570310.pdfIn PDF document text
    • https://roxilegetewus.weebly.com/uploads/1/3/4/7/134721251/8699356.pdfIn PDF document text
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/wokusinoriwiz-jaromujekofed.pdfIn PDF document text
    • https://cdn.sqhk.co/madufuxenuw/2jdZI4D/aesthetic_space_wallpapers_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/diaKhgZ/98048882045.pdfIn PDF document text
    • https://jedegifopa.weebly.com/uploads/1/3/0/7/130738854/jaridisefefaf-kiwenizu-pewak.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/eibjfIw/galaxy_theatres_luxury_boulevard_mall_showtimes.pdfIn PDF document text
    • https://sixebujexe.weebly.com/uploads/1/3/0/7/130740217/44165f0371f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8598588-cc13-4fcc-84d2-fcea74781f0c/motorola_ht1000_radio_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2bb7944-5dd7-4e39-9859-5cbbd979a1b2/nemidozeme.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_26538a95e5b4453a9e90a950765599dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c73a5b7b-95d3-493b-9e4f-48fff3c502e8/renevepikibu.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/zikisixuganasagibusosis.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/revutuzozunadovivilol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd739ba-e138-45e1-ba8a-cff8bd39e4f9/linux_beginners_guide.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_8dcf827039184414bc3ad3652050f8d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2847b71c-1527-4c3c-af81-c55980cab578/how_to_remove_petsafe_collar_battery.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f67a9b6-fea9-4c32-b4fc-3221adc565f5/zonurasef.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/15870945465.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_f088428fe9574f9b97eb31804fd6b61f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/banula/indian_express_today.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/664cfaea-eb74-4096-8df6-b0c06a24e8d8/why_should_every_kid_get_a_trophy.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/lg_oled_tv_55c8_manual.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_f415c01f93a54cb7a6f5eccbe0ea1aa5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/096f1a33-ef7c-4269-bc73-5c3a9b6b4280/olympus_om2_spot_program_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aa96c8-48dd-4c5b-8e73-e904335c4f00/tejojagixa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE804 5340 bytes
SHA-256: d103bd22a788260b463886c3f1e729a440bf575a9c44a2f875869355346e9b82
font_01_sfnt_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10548 bytes
SHA-256: 622f609989b0a6e4dd7590fe62497f3428f864d7c02f9711d20fd4b0459ce6cb

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