Malicious PDF — malware analysis report

Static analysis result for SHA-256 704fc1e509b4f6f9…

MALICIOUS

PDF

78.3 KB Created: 2021-06-05 16:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: cdde1795a95da3e4eba7d7a54a269475 SHA-1: dc65977d1bf964b82ecff60570317c3a650c9ec1 SHA-256: 704fc1e509b4f6f92235b6ff56019faca3491a1c6669f418e0a6113ccc950dd0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, many hosted on disposable domains, which is characteristic of a link farm used for phishing or distributing further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/pbw?utm_term=ieee+802.11+ax+standard+pdf PDF link annotation
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/865db6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4526930/normal_606a886c85dd2.pdfIn PDF document text
    • https://vokubopupabilu.weebly.com/uploads/1/3/4/6/134691430/989254.pdfIn PDF document text
    • https://ximavubakalik.weebly.com/uploads/1/3/0/7/130776508/ce3bcc54e9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392207/normal_604b675d723b8.pdfIn PDF document text
    • https://sovakevu.weebly.com/uploads/1/3/4/3/134341498/wiwisuvewikejezabe.pdfIn PDF document text
    • https://xovokemuzulu.weebly.com/uploads/1/3/4/7/134703915/nebalebuta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368478/normal_5ff913ff8200d.pdfIn PDF document text
    • https://legovizadedugid.weebly.com/uploads/1/3/1/8/131856283/mabegeje_vegakumavudan_naxenarexowup_renigofoxev.pdfIn PDF document text
    • https://jejabulalirolu.weebly.com/uploads/1/3/4/4/134464322/simuvawuse.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/5269829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458404/normal_605ff6b597c5b.pdfIn PDF document text
    • https://gijowazav.weebly.com/uploads/1/3/4/0/134097260/noxebobe_wigujakekim_zazejone_wotekemus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_6039b7f3e761f.pdfIn PDF document text
    • https://bexajaburise.weebly.com/uploads/1/3/5/3/135345802/mezovaxi.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/foxonategozazowofiv.pdfIn PDF document text
    • https://pujibotawajifuw.weebly.com/uploads/1/3/1/3/131379639/kemaxixituka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453532/normal_60ba8cf8465f7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 5560 bytes
SHA-256: 0c034449f89526343b22194d294b146fb381606131fe0989ab59817450eb462e
font_01_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 10436 bytes
SHA-256: d59877879debcebb6832b189c676790665264353c86092954ae707b0b248541f

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