Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d8fb89eb46911a…

MALICIOUS

PDF

84.8 KB Created: 2021-03-10 20:29:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc92bd0f28d8a3f60ac31ab2e2a27640 SHA-1: 94ae04af0a4dbf00426981ddcd218ae925e6ece5 SHA-256: 75d8fb89eb46911a01d00a83b303e23189c29daaef632b7dd897f21f5ad54f7e
194 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_LINK_FARM' indicates this is likely a link farm, potentially for SEO manipulation or to distribute further malicious content. The presence of 'utm_term' parameters in some URLs suggests a tracking or redirection mechanism. While no scripts were extracted, the structure and link farm nature strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://resalured.ru/123?utm_term=tasmanian+tv+guide+app PDF link annotation
    • https://cdn.sqhk.co/kiribikiv/ihMjaij/singing_in_the_rain_good_morning_clip.pdfIn PDF document text
    • https://cdn.sqhk.co/zirevazul/ehhifji/stickman_war_zombie_attack_survival_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rovujesox/GihYihZ/seesaw_balloon-_wire_cutting_procedure.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/aCgiicT/defender_tower_defence.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/eCU06sg/tripp_trapp_baby_set_grey.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/ipI8hg6/felifotomilere.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/8701654.pdfIn PDF document text
    • https://mujoganik.weebly.com/uploads/1/3/0/7/130776873/vuxura_nerapipi_fobojupebipoge_gakidazi.pdfIn PDF document text
    • https://sinuxogutit.weebly.com/uploads/1/3/4/5/134505158/3b47b05f3.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/ifDWusf/soketovixidolebib.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://s3.amazonaws.com/ladiwuzetawedi/povulitefevazed.pdfIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_145c652806504bfd8a9e94a65dcfbb80.pdf?index=trueIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_584a55ad6847470e950b679ed6233374.pdf?index=trueIn PDF document text
    • https://ddf64d59-5240-4154-9987-17dfc28e22c7.filesusr.com/ugd/cec570_b2ca6476172c40f2af9170c21bea7f43.pdf?index=trueIn PDF document text
    • https://1f2f8e77-98df-4c5e-b88a-83bc2b612b58.filesusr.com/ugd/5c7528_a01eea03708842ef98f083e55577cff6.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_7940f3f596244398a08ec3102bcd9bc6.pdf?index=trueIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_9533c564bcc043f2842846b6c51a3a51.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vigevot/xibaduwobivofupuwad.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_9541f758c1f64033b64c441a0d2522b0.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3898a0117750489f97b97d21a69df72a.pdf?index=trueIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CF 4932 bytes
SHA-256: b3cc06440297146e0d5c0398b7a99fa964e6f6215fb75c75d0b69a57e205c39a
font_01_sfnt_off0001067d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067D 2024 bytes
SHA-256: 6edd2dc65f8cc0d4bfc465674af3a6957927c9580e196fa1f2ecab0bfce717d7
font_02_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 11840 bytes
SHA-256: b4f93800b56311c8dd740253b34e896fe0a645112333beea16c8b1df364e82a8
font_03_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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