Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8bfdcd03897dfc1…

MALICIOUS

PDF

96.7 KB Created: 2021-03-13 17:22:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8a5b6ddfb40710c5cda6b0a7cd499fa8 SHA-1: 1541e7447620f661d5b02faf7c5befca06fa81c2 SHA-256: c8bfdcd03897dfc1fa15b1aa7c9198583305ab32615393807c9cdb15d5d269a3
186 Risk Score

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 0.9989

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://golowaki.ru/award?keyword=thematic+apperception+test+examples+pdf PDF link annotation
    • https://xosebabonewita.weebly.com/uploads/1/3/4/6/134613761/benudegukuzotugitewe.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/88465281047.pdfIn PDF document text
    • https://dotofinadi.weebly.com/uploads/1/3/0/7/130740455/1862782.pdfIn PDF document text
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/8626267.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/turbo_chameleon_64_amiga_core.pdfIn PDF document text
    • https://dobizonetalede.weebly.com/uploads/1/3/5/3/135394553/xenozop.pdfIn PDF document text
    • https://visuwinewuj.weebly.com/uploads/1/3/1/4/131407241/jeboxorojopexu.pdfIn PDF document text
    • http://mosomupusafebin.medianewsonline.com/how_long_does_a_ford_escape_hybrid_battery_last.pdfIn PDF document text
    • https://rominekajamarol.weebly.com/uploads/1/3/4/0/134040464/afa45d.pdfIn PDF document text
    • https://rusigeju.weebly.com/uploads/1/3/4/5/134596119/buloninulenexap.pdfIn PDF document text
    • https://radofagomomixa.weebly.com/uploads/1/3/4/1/134132329/9398806.pdfIn PDF document text
    • http://fosipuzo.mypressonline.com/history_of_computer_from_abacus_to_present_timeline.pdfIn PDF document text
    • http://zevupixikug.mywebcommunity.org/algo_trading_books.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_750dd3d4983f4a30a934a3a482deb00a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c581f9c-98b5-4b56-a9b7-cf220b370b0b/how_many_hours_to_study_for_dental_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c78c58-5d1c-4e81-83da-ff6615758b04/how_do_i_reset_my_skullcandy_wireless_headphones.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/fulogeleb.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_4f2f8373260748518616544a2a47b5b3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/280b9521-96dd-4a17-9f10-d8d63f37f1b5/miller_syncrowave_250_pulse.pdfIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_881226f14aa7461e880cfbb7dcb860b5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2ce0c8-22ac-499a-b52a-d110700f24c2/16340578073.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/ed_sheeran_perfect_sheet_music_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66ce3841-3974-4395-a637-95cef4ea9f8a/80885013925.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D67 5200 bytes
SHA-256: c4c0adf11e1354116427dc461ed48f009302825524dbbeebdd866a7e8f9aed98
font_01_sfnt_off00013ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EE3 11980 bytes
SHA-256: ea47e312ef7a30c09277a613dd9009e5dded8a0a5ceb3c20e0861fbe716674f4
font_02_sfnt_off00016678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16678 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34