Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcc8db3ee90fb35…

MALICIOUS

PDF

95.2 KB Created: 2021-05-09 21:53:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 537f188ecef43b2d995a8a22129cc4d4 SHA-1: 10be557fa750d8261886e83e07d94ad9d70edafe SHA-256: 7dcc8db3ee90fb35a223a2c9693999f0871207e24efcc4aa638c2ca2f6e88282
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 0.9990

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://dafemum.ru/strik?utm_term=hamilton+beach+xl+convection+oven+with+rotisserie+watts PDF link annotation
    • http://buytoday.cc/why_is_my_microwave_not_heating_properlykiudo.pdfIn PDF document text
    • http://zulesaxeririv.sportsontheweb.net/ccna_exam_answers.pdfIn PDF document text
    • http://joy-todays.online/oceans_hillsong_united_sheet_musictmjh6.pdfIn PDF document text
    • http://buyervannakupitvsem.xyz/samsung_remote_pairing_says_not_available0aaay.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373987/normal_606c7f97ed026.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_5fdea30d63176.pdfIn PDF document text
    • http://fepaporipevari.mypressonline.com/xipifepuzakiloxizededolit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452373/normal_6042080dba6ea.pdfIn PDF document text
    • http://axacheat4.xyz/download_sx_os_betar6smi.pdfIn PDF document text
    • http://hiziryigit.online/741694913334inie.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/what_does_permissible_mean_in_islam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8a05da06-75fd-4b4b-8779-f7668a2fa4a0.filesusr.com/ugd/da32d9_4d86a5c869a84454986f1edf4b1d8959.pdf?index=trueIn PDF document text
    • https://a694a867-b0fa-45cd-b082-7f9abf80b1a7.filesusr.com/ugd/430cb2_cdc6756513bc4804a94654cd17db81bb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ce8b88-573f-4833-99fd-3d5ce3ddd160/94086747116.pdfIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_308d76baae9b4e59a8891945693fea7e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f91407c-0a26-4e80-a077-ebb3acb9b9ad/46086793807.pdfIn PDF document text
    • https://30d6ba4c-d201-4e26-8f31-a0e059b28788.filesusr.com/ugd/f9b8bb_73b64f190cf74dc985bacf4a5744b1a6.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_3e086926abad4d9a8a81a764a8d56d03.pdf?index=trueIn PDF document text
    • https://5663e088-3595-439c-971a-5873693bee35.filesusr.com/ugd/e98895_ea47c120a27a4d61a73e386d888e5861.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_105c8c7e68654647994c115c5f6af52d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2374f5d7-abbe-46d4-8a0f-e62c659eddfb/famoginilokawevabumiz.pdfIn PDF document text
    • https://aee666f7-65d2-4416-8089-42e5bd85255d.filesusr.com/ugd/c4036c_c579a3bd152e4aeca5dc6c7bd4eaaa85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/725ba9a9-baba-4cda-890a-4bc8265e2071/toro_lawn_mower_repair_parts_near_me.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_off00012b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6C 5360 bytes
SHA-256: 67ba07a9e58234b6c4c0d89cc7740ed4139afc4b891e91e0bdf40084785a632d
font_01_sfnt_off00013d80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D80 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0001460d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1460D 11404 bytes
SHA-256: ff15c1907cc3e4918ab58ea845d678990089e4953e6cd75f6728e829ec7afaac