Malicious PDF — malware analysis report

Static analysis result for SHA-256 7263a6a8b0469eee…

MALICIOUS

PDF

78.3 KB Created: 2021-03-01 15:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6cf0ac18db9b2be1ffb6cf50ef3661f0 SHA-1: f4a37d8e56bc8994b826e82c0cc3d4bc619b73a1 SHA-256: 7263a6a8b0469eee81e29bc51876d58255a8f3abf7ce3fbd494b05a888fdf702
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, and includes a UTM-tagged URL that appears to be a redirector. This behavior is indicative of a link farm or phishing campaign designed to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/strik?utm_term=dell+latitude+e6530+i7+3720qm+specs PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4393220/normal_600747c4de040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451363/normal_600d25df84a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403948/normal_6012ccfc22145.pdfIn PDF document text
    • https://pirovosarelivo.weebly.com/uploads/1/3/1/4/131406751/pawitovotave-dedabetenipuxoj-piwebilomeli-lamino.pdfIn PDF document text
    • https://susemozud.weebly.com/uploads/1/3/2/8/132814624/ribebofigojo-fodefipe.pdfIn PDF document text
    • https://vefoduwuwi.weebly.com/uploads/1/3/4/9/134902927/disapa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_6007a898971f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_6027a31938a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470521/normal_60207f3d6a994.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381964/normal_60142f169f749.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_60001fa34a8a6.pdfIn PDF document text
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/3803560.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dokaxakamuwu.rf.gd/pukiliratararex.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/ardaas_karaan_full_movie_okjatt.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/mowogajikadopug.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/29662172878.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/deritodisivosejarife.pdfIn PDF document text
    • http://lepomosafajuki.rf.gd/camo_camo_baby_song.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_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 6044 bytes
SHA-256: 715a1cc433c9352aae56e30c5d4710eb4946169a795c5818e9d9fe67b72c6aec
font_01_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 11928 bytes
SHA-256: 6f4960fc00944e71e8e0bb5edf969894b93a2b66c5f4610a7bd47ec75e5fe2bc

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