Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9605e4711970bab…

MALICIOUS

PDF

78.5 KB Created: 2021-05-29 10:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c8e7ef905fec86d531dbe25afb4572c8 SHA-1: 55b7b64152741fd7303c414c400407012c5cb923 SHA-256: e9605e4711970babade55d80aa5d9dd10d0460f5653d4f6281734b50aae6f885
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 0.9997

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://nipisod.ru/strik?utm_term=john+grisham+books+in+order+of+popularity PDF link annotation
    • https://fukuzemuk.weebly.com/uploads/1/3/5/3/135306557/mesabuwokesi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_5fd8095a97c34.pdfIn PDF document text
    • https://xakasevam.weebly.com/uploads/1/3/4/5/134509313/tibogedajebilo_ganunuzaxij_zunenidot_foviwivuwitas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448991/normal_606c9302c7038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411501/normal_60347fd284f93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380393/normal_6068c8f20ed07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_605099929cc81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_6064eabd5cab6.pdfIn PDF document text
    • https://givurubikuz.weebly.com/uploads/1/3/1/4/131482907/sadimosajebaki-verepofak-mofigopifovil.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/9281486.pdfIn PDF document text
    • https://jetireduru.weebly.com/uploads/1/3/1/4/131453335/vibiguki.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4379486/normal_60b1e061dc306.pdfIn PDF document text
    • https://voxapuxunud.weebly.com/uploads/1/3/1/3/131381802/1e943c32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_606b3ef7495e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450419/normal_604cd427a236b.pdfIn PDF document text
    • https://kujakaxu.weebly.com/uploads/1/3/5/3/135347331/8749250.pdfIn PDF document text
    • https://wujumumokujot.weebly.com/uploads/1/3/4/6/134613036/1410886.pdfIn PDF document text
    • https://robivitoj.weebly.com/uploads/1/3/4/3/134334713/4448e3c351.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/2145365.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_606285e73410d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_6003dda9e16d5.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_off0000f646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF646 5748 bytes
SHA-256: 28781135394cb72e67e572be9b47799e078892a018f0bc0d93ce6fd372da86c8
font_01_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10228 bytes
SHA-256: 4f38e594fcaf45ed2a1c02b6bd57c017f5bc245c8fa126015c87bffa4aff66b2

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