Malicious PDF — malware analysis report

Static analysis result for SHA-256 6822605abdfb0230…

MALICIOUS

PDF

73.9 KB Created: 2021-04-30 08:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d955f00d7d0dc33afa074ebd3e2a03d1 SHA-1: 1566a02af074076eeb2ee9c30c8eb464add7c898 SHA-256: 6822605abdfb02304488532cc1efdfb1cbfd8f3bb176a1f030814c7749bdc81f
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 0.9999

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://midufefew.ru/strik?utm_term=2003+jeep+liberty+renegade+lift+kit PDF link annotation
    • https://dodezugufiz.weebly.com/uploads/1/3/5/3/135331092/3355100.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413346/normal_60629b8465ce6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371247/normal_5fd1942371b9c.pdfIn PDF document text
    • http://ladujose.sportsontheweb.net/kojuwa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_604ee68f4a268.pdfIn PDF document text
    • https://sowimarigakuni.weebly.com/uploads/1/3/4/7/134705136/jawonube_mabugujir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fed482c3fe89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451375/normal_604ec6d95d7f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471249/normal_5ff5467ab86d3.pdfIn PDF document text
    • http://wimudevereru.sportsontheweb.net/brand_audit_report.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_60468bb57ec67.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/gagagakigibapo/mini_dv_tape_converter_to_computer.pdfIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_9148e63033b4447399968de37faa271f.pdf?index=trueIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/agile_software_development_method.pdfIn PDF document text
    • https://1801fa0f-56e4-4894-8452-b8e06651d4be.filesusr.com/ugd/868401_c3c962b0ae054706b91153469b5dc17d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/96104134791.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/animation_programs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/nickel_affinity_chromatography.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_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 5756 bytes
SHA-256: 5e77bc5397fdf6cda475984541cd414bfaf4484de053c031bda472b042cc4503
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 10688 bytes
SHA-256: 82d3c76dd7a1e368a9932a494286eaf898a9cb869728ee0543b3051bec8cf8f3

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