Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd74cc8691e2dd6d…

MALICIOUS

PDF

81.0 KB Created: 2021-06-06 06:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 21d4ead2a987392c911a78d13fef32d9 SHA-1: 55761aa7cb9fd42bc9a18e00b210ec3e28c1b3e8 SHA-256: fd74cc8691e2dd6d9d246d7eaf6f0e75df847f61d2d382776844a9df45c696d9
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, with many pointing to disposable hosting and utilizing UTM parameters, suggesting a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive link farm points to a tactic of overwhelming search engines or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/pbw?utm_term=how+to+set+time+on+citizen+eco+drive+watch+e820 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502436/normal_6051f0badb848.pdfIn PDF document text
    • https://kinofipu.weebly.com/uploads/1/3/4/7/134725163/530959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391599/normal_603ad2ed0f460.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_604f79902390f.pdfIn PDF document text
    • https://guwidavimup.weebly.com/uploads/1/3/4/8/134893931/murute.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412161/normal_60049df32c77f.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/welominunesakebid.pdfIn PDF document text
    • https://sarenudubafuje.weebly.com/uploads/1/3/4/6/134680246/galabumoponupi_nezexiruw_vilopuw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490519/normal_5ffb22cd479ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447276/normal_60345ccf5d9a9.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/lelitoguvapadum_daduxisulenu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392873/normal_6007c34860ae5.pdfIn PDF document text
    • https://kaboraze.weebly.com/uploads/1/3/4/6/134667384/659807.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493876/normal_602c06a54958f.pdfIn PDF document text
    • https://rajarajo.weebly.com/uploads/1/3/1/3/131398110/jowowi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tukufidanega.pbworks.com/w/file/fetch/144426099/madras_university_arrear_exam_hall_ticket_april_2021.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/15172471336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ff630f7-48ca-4a68-a31b-adeb8ae06e48/american_natural_history_museum_nyc_hours.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8182fa94-ffa2-4768-92ed-3abb58c4ff13/37390560971.pdfIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144425715/dolarofawimemazojavujodub.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144614562/vozef.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD44 5776 bytes
SHA-256: b60efea40f0a3b4ab07e8b526d7fa5459092409a603824a912741859756d8d8a
font_01_sfnt_off000110e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E3 11076 bytes
SHA-256: 0948f310833dbf1c8173b0c3f9769446c168d243417360cfa01e8dba2a81c92b