Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa491ca4c18cfeea…

MALICIOUS

PDF

78.4 KB Created: 2021-05-07 04:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e9d2ae0e70b46b1bc8dd17060dbddd78 SHA-1: c6c1526c6d1697113a9adf6d069dd8496caa6243 SHA-256: aa491ca4c18cfeea2cff9fd98c61cf736e5bedb40371f8ce7eb669b4b4391de0
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a lure related to car maintenance, disguised as a guide. It embeds numerous external links, including one pointing to a link farm that hosts other PDFs, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/strik?utm_term=how+to+reset+bmw+x5+service+engine+soon+light PDF link annotation
    • http://katermore.ru/warhammer_40k_rpg_deathwatch_core_rulebookcnwd5.pdfIn PDF document text
    • https://gabelutabidos.weebly.com/uploads/1/3/4/6/134678244/416b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452389/normal_6009c63a0c399.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/gabanibidazowi_begefed_nonerajimaza_sekijebaxoxe.pdfIn PDF document text
    • http://productwood.ru/nizuroziverexipitowesesb0bxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_5fcf2f33a3824.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/7327043.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374685/normal_5ff9c09530b16.pdfIn PDF document text
    • https://tigasuzile.weebly.com/uploads/1/3/1/3/131379741/jenapob.pdfIn PDF document text
    • https://wezalowesugalu.weebly.com/uploads/1/3/2/8/132815960/1c6f17ee28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_60639224aa8d0.pdfIn PDF document text
    • https://rabivavas.weebly.com/uploads/1/3/0/9/130969809/b8e4f.pdfIn PDF document text
    • http://motivawka.online/4090455228069fcl.pdfIn PDF document text
    • http://options.expert/97625175451p7nn1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499656/normal_6026d23004ffd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kukazowox/atul_gawande_books.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/8270856938.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/xapesiwekugatu.pdfIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/tatexonasipukovep.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/how_much_is_a_wolf_double_oven.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_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 5448 bytes
SHA-256: 7ae70598effd94b212d3c55b88036959deb862240612dfd4cf4bcdd05669b2da
font_01_sfnt_off0001071f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071F 10668 bytes
SHA-256: 73e4e7fb353c9bc87c8bbe09db922c70b709f4146c09508657723380f2e93d0c

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