Malicious PDF — malware analysis report

Static analysis result for SHA-256 977c02506451e145…

MALICIOUS

PDF

78.7 KB Created: 2021-06-05 23:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 415cff931805aecffb23279579d4a1ab SHA-1: e6ba16bd759127a316b8ed73b2886f6e246f1183 SHA-256: 977c02506451e145f3a2632166391c9c4d3aceac1440b80e95462e71f49e43be
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/123?utm_term=emotional+quotient+test+with+interpretation+pdf PDF link annotation
    • https://lakujasoramaw.weebly.com/uploads/1/3/4/4/134400634/7570143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6011032347bb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492272/normal_5fd2dbdb206d2.pdfIn PDF document text
    • https://wuvatefowid.weebly.com/uploads/1/3/4/4/134470889/dufepir.pdfIn PDF document text
    • https://voropulunonuz.weebly.com/uploads/1/3/5/3/135316946/6107039.pdfIn PDF document text
    • https://nemoderi.weebly.com/uploads/1/3/2/3/132302766/butatuguvisedo.pdfIn PDF document text
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/xozulurapef.pdfIn PDF document text
    • https://vovavurag.weebly.com/uploads/1/3/0/7/130739927/lixowerale.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4420470/normal_60b02f352ad83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414352/normal_604e2a94a4afa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_60b856ebe18f4.pdfIn PDF document text
    • https://dujomujur.weebly.com/uploads/1/3/4/8/134883281/5fed8.pdfIn PDF document text
    • https://befugusugub.weebly.com/uploads/1/3/2/6/132683140/jixujelale_dugexojun_rekedivoniwe.pdfIn PDF document text
    • https://gorijifezavu.weebly.com/uploads/1/3/4/5/134502749/bowudabunedabo-juwometoviwon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_602096bbc9869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449627/normal_5ff75ebc59c6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_604b2ea16c133.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/dapumino.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/nedipijowukejit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nozobitativi.pbworks.com/w/file/fetch/144552861/87449873859.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/how_to_use_swingline_electric_stapler.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_off0000f536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 5456 bytes
SHA-256: ced3e37184a6ac9d2d82304e74bb89e8db59f3e6b6418424fc06c5aad40edc17
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 10920 bytes
SHA-256: 495a273670ae45fb79d13fcd0ddc47aed0d4369609868e360fcb8058205e0d31

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