Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c4748241d7aceb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-08 09:54:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b79f8f63ffde49c95cfde54959ef65b5 SHA-1: 35fe3c8766467d8dfec75ade5c9a5ac7086ee510 SHA-256: c8c4748241d7aceb3993348c11d629992ce788c6609e7eca5787ec2b537f53ce
194 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm with numerous external URIs, including suspicious domains like druttle.ru and virnet77.ru, suggesting an attempt to redirect users to potentially harmful content or phishing sites. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a deliberate effort to create a network of links for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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://druttle.ru/wix?keyword=jennifer+lopez+award+show+dance+2018 PDF link annotation
    • http://virnet77.ru/ivory_lace_wedding_gown9zk2r.pdfIn PDF document text
    • http://austritkfa.com/what_book_to_read_after_the_hobbit9mvqu.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/vHchhk4/tuserituxiviveg.pdfIn PDF document text
    • http://obsluzhivanie-kompyuterov.moscow/697994292089gnug.pdfIn PDF document text
    • http://zebrait.fun/5127658073lmgeg.pdfIn PDF document text
    • https://cdn.sqhk.co/sawitofi/gfpwjig/ninja_blender_costco_warranty.pdfIn PDF document text
    • http://podarokinsta24.online/33224368645qoh7m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_116c99d7d5374b9f9741a54f74dec30e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/294a4717-c639-465c-ae6c-78870a7739d4/vebojevadipevixixexixak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37a1defa-9990-4140-a8e4-73bacfdde749/20252859273.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_029f60143f6441caabd24f19ca27bb06.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/410646eb-1d1d-43d9-b13c-6925e7adbb61/if_you_hopped_like_a_frog_by_david_schwartz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb80a859-f47a-4f2c-9734-ba2bd7ad8134/31358001044.pdfIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_3da27c5eb35a4822acd2a7eff60bade6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8f79ca-3af3-4d22-b45c-a53a72cb38df/lerediraximiwuxexir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054e565b-8ce5-4367-92db-adb5220a62d1/aa_na_meeting_list_gainesville_fl.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_b0f2ca5513ec4884a0d396d9d4e8bdc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6526ba9a-7e02-4365-a76c-f2eb0ecf012e/heat_n_glo_fireplace_repair_near_me.pdfIn PDF document text
    • https://17b782ec-5361-4648-a7e4-211b27192e07.filesusr.com/ugd/b371d9_ac19de7a0e99438eb58bfb643883ac9b.pdf?index=trueIn PDF document text
    • https://99470c7d-c692-4648-a7b8-36ea19db2883.filesusr.com/ugd/ab059d_c093e3b07eca41be888470a129ad6552.pdf?index=trueIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_67251aacf1f749c6bf8f189ce88e15dd.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_off0000f42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42E 5892 bytes
SHA-256: ed31e7e944a589c0cb7a4f1e291966658717ddefd38ec1e4676944b2b3914961
font_01_sfnt_off0001085a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085A 10492 bytes
SHA-256: 0ec9583f5948a8743582dc57d6b2ecba2b9a306f79bb85c0d81841ec16313511

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