Malicious PDF — malware analysis report

Static analysis result for SHA-256 38221042193c72f7…

MALICIOUS

PDF

99.4 KB Created: 2021-03-19 18:56:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: d96dee9e0aba56517c7dc02bc546bc3b SHA-1: 0b68400896d6a765507b1cb005d5b8d4c386b08b SHA-256: 38221042193c72f70fe931fd2004f3c92be5ccaf7ecd40a8a7aa9b18ac60d1f3
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically a phishing or trojan distribution campaign. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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/aws?utm_term=cobra+148+gtl+variable+power+mod PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366382/normal_6043e6db2eb90.pdfIn PDF document text
    • http://semengergel.ru/deladxl9bj.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/hjaZibN/live_or_die_zombie_survival_offline.pdfIn PDF document text
    • http://mscgis.net/intrapartum_fetal_monitoring_guidelinesnn2x1.pdfIn PDF document text
    • https://cdn.sqhk.co/wixefawoz/5sH5xvI/fnaf_fan_games_online_free.pdfIn PDF document text
    • http://gouliwer.online/atal_bihari_vajpayee_kavitaz5h57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_5fd8f6bdedb15.pdfIn PDF document text
    • https://cdn.sqhk.co/kapideto/dieypJW/ganiromevip.pdfIn PDF document text
    • http://vitrinachel.ru/virta_health_keto_dietzc24a.pdfIn PDF document text
    • http://nuveclovet.xyz/765028044918a8u1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461766/normal_5ffffafcae4c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481280/normal_6002a541597d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378604/normal_604400d011cb0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_9a23330da00d4a438f708b4e99f26c42.pdf?index=trueIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_923552aa82ff4cb981dce04844419034.pdf?index=trueIn PDF document text
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_4677271f1dcc4571834744467abc1977.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_2e9f06ba9a664f428eba1636ac492995.pdf?index=trueIn PDF document text
    • http://ketaxesam.epizy.com/4060511725.pdfIn PDF document text
    • https://f1cf40e8-986f-4c62-a027-f786e12be648.filesusr.com/ugd/a58502_9d131552801949babc37e67b359e68d8.pdf?index=trueIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_b93e4607b58f43a6b69078af7ec9e943.pdf?index=trueIn PDF document text
    • http://lepogulajobuguk.epizy.com/nubuzogotarazamepuba.pdfIn PDF document text
    • https://13ea8442-998f-4f14-ba3b-7f37e53a414c.filesusr.com/ugd/008a9f_1a2855e2d30b4e938fd0d1e2e7359e19.pdf?index=trueIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_62314fbe6232431ebfedcfcba26bd799.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000145e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E5 5632 bytes
SHA-256: 8d13515c583b0e7ea8fe920ab7deb2a21678ee72f4c2f8befdb207243b0093f5
font_01_sfnt_off0001590f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1590F 11532 bytes
SHA-256: 7a0a1fc0e2196c37f6e117f26c45a57296f1565daf63923107f64810f4dced9d