Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e14653baf91d7a6…

MALICIOUS

PDF

71.7 KB Created: 2021-05-04 05:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6a92a77225567507fd4e120fb9155f6d SHA-1: 372eb42b8581f3ce97fadcdea37cce99df467ea3 SHA-256: 3e14653baf91d7a6c81f1c04d58c81d5cce58aa7867704ff496003b824df2039
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, including one to 'https://pelibifir.ru/strik?utm_term=how+to+calculate+cm2+to+km2', suggesting a phishing or SEO spam campaign. The document body, though heavily obfuscated, contains references to unit conversions and the wkhtmltopdf tool, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/strik?utm_term=how+to+calculate+cm2+to+km2 PDF link annotation
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/9236195.pdfIn PDF document text
    • http://stixlife.info/2004_dodge_ram_1500_quad_cab_5.7_hemi_specsiau17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_606965f2490d3.pdfIn PDF document text
    • https://rejezulibege.weebly.com/uploads/1/3/4/0/134018585/2009913.pdfIn PDF document text
    • https://lituveso.weebly.com/uploads/1/3/4/3/134362288/296ff94d79.pdfIn PDF document text
    • https://dagazafija.weebly.com/uploads/1/3/1/4/131484603/pagosuron.pdfIn PDF document text
    • https://xutepokukofegik.weebly.com/uploads/1/3/5/3/135391302/sugix_gazukadod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464527/normal_5ffa946814603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475000/normal_605661c8bdf32.pdfIn PDF document text
    • https://bosubunu.weebly.com/uploads/1/3/4/6/134693877/6935120.pdfIn PDF document text
    • http://fastgetme.online/mixonovojizibuwuzinapelij46e2i.pdfIn PDF document text
    • https://taxepenobeg.weebly.com/uploads/1/3/4/3/134355702/577a2.pdfIn PDF document text
    • http://bandalet.club/doctors_note_template_microsoft_wordbjxgq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468572/normal_5ffe983c523e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385410/normal_6068c588018e7.pdfIn PDF document text
    • https://boxudeso.weebly.com/uploads/1/3/4/3/134320939/cdf71354.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/7d8cd8151624ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9bccc122-af72-421d-8e7b-cf281dd0ec24/sugedibutobimelap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00091873-6a08-409c-a6fa-e6d896394deb/sibavisudosiliwoxaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09f7e09e-d169-421e-af4c-80a2adbbc7f2/what_is_age_appropriate_clothing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45ce914f-8daf-40f4-928d-111c0a7a4d80/72971400960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c252e518-2cf2-4852-8dd1-5040475cbc8d/bekim.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_off0000dcce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCE 4920 bytes
SHA-256: 69de00727d5253c5ca18452a6f476ce4291d6651ecae729053b4537c526c4c7e
font_01_sfnt_off0000ed8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8D 10700 bytes
SHA-256: 948b3bde8c7e7482cb5f6c69805d850c507e8c28fbfdc5b04dd4699aa909780c