Malicious PDF — malware analysis report

Static analysis result for SHA-256 916f73e9afa9fb78…

MALICIOUS

PDF

73.6 KB Created: 2021-06-04 09:40:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5a1bfa72ad241c01881c709e5bdc11d1 SHA-1: 92ecfdb6c0ceb0c99f66429f1678d31dc0a5948a SHA-256: 916f73e9afa9fb7885849223aabb76b77cbbc619346fe522eab36f3728e470e2
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://crewmak.ru/pbw?utm_term=cuisinart+ice+cream+maker+instructions+video PDF link annotation
    • https://lozojoni.weebly.com/uploads/1/3/4/3/134358657/fuzuxuwoguta.pdfIn PDF document text
    • https://jatitebomotopoz.weebly.com/uploads/1/3/0/7/130776336/54ae57e98.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/1687220.pdfIn PDF document text
    • https://vowimodinin.weebly.com/uploads/1/3/4/5/134599446/jufekewipezusumegewu.pdfIn PDF document text
    • https://nudegono.weebly.com/uploads/1/3/4/6/134682657/nidukagiligaralibu.pdfIn PDF document text
    • https://jatufabafalili.weebly.com/uploads/1/3/1/6/131637938/lemikogubonurej.pdfIn PDF document text
    • https://dununatanag.weebly.com/uploads/1/3/0/7/130775655/1225115.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/5294744.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5feff4f9f08fc.pdfIn PDF document text
    • https://nalirukixew.weebly.com/uploads/1/3/0/9/130969663/3d2fbb9e.pdfIn PDF document text
    • https://senuwisaf.weebly.com/uploads/1/3/4/0/134018119/09d8099d9.pdfIn PDF document text
    • https://bijefalatobin.weebly.com/uploads/1/3/4/6/134629646/guliti_bepefejefasajax_kadepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_60233731cc319.pdfIn PDF document text
    • https://giwafadewixagi.weebly.com/uploads/1/3/4/3/134369241/e8b69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410730/normal_604af4cb73215.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakewizajupe.pbworks.com/w/file/fetch/144579834/fajedosubemusofalogu.pdfIn PDF document text
    • http://pibadaro.pbworks.com/f/67308422657.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144462255/husqvarna_hu700h_spark_plug_gap.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144575937/norezim.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144478197/how_do_i_change_my_singtel_voicemail_pin.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144593925/stress_and_distress_book_free_download.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_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 5080 bytes
SHA-256: f5b62911bae8e46e573f9b3eddf9ab6dc5a2cd813979fb543188dd85d1d4e6ee
font_01_sfnt_off0000f4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D5 10544 bytes
SHA-256: 82ab940df8c2bb1f049c0cd8a3cff8929a293fab408b2f520657e669505f8b52

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