Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd17f4b667128fbf…

MALICIOUS

PDF

75.8 KB Created: 2021-02-18 07:00:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 255708685ac513412c4e5d844a039262 SHA-1: 2d3d859f6bbb7b47d6414b199e4afff620309d8d SHA-256: cd17f4b667128fbf3f1e8bcebd3e9db2abe6a3f79ee4147843c241fc7988b5bf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The primary URL, 'https://seumenha.ru/wix?keyword=black+and+decker+cm2020b+manual', suggests a potential SEO manipulation or phishing lure. The presence of numerous external links points towards T1566.001 (Spearphishing Attachment) as the likely initial access vector, and the exploitation of PDF vulnerabilities for execution (T1203).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/wix?keyword=black+and+decker+cm2020b+manual PDF link annotation
    • https://cdn.sqhk.co/zapiseniw/jRLktD1/gixarasebabofup.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/hj2ijhi/wonder_pool_apk_mod.pdfIn PDF document text
    • https://kiwitelovig.weebly.com/uploads/1/3/4/3/134358902/rajilekoxaxom-wuguwogapusato-morafelapam-takarinemujaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_60292033ee67e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417664/normal_5ff867eded744.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/1359589.pdfIn PDF document text
    • https://cdn.sqhk.co/kusewupudin/jemlnLb/26006534057.pdfIn PDF document text
    • https://jewukezi.weebly.com/uploads/1/3/0/9/130970006/loposaferumuto-vidiv-genuwe-moxetowulowi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404290/normal_5fd1d0e478319.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/hviiUkG/vimarsh_portal_question_paper.pdfIn PDF document text
    • https://kominalekawer.weebly.com/uploads/1/3/1/6/131636772/f5d020a88b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_5fcd2f32008a7.pdfIn PDF document text
    • https://fipamowusaki.weebly.com/uploads/1/3/4/8/134879766/kogijiwijoxul.pdfIn PDF document text
    • https://puzomukasudugun.weebly.com/uploads/1/3/4/8/134865935/juduzifexexidadisa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366331/normal_5fdb118cf072a.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/lezerawe/dojetuwitabelajebinadeju.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/free_service_blueprint_template.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_off0000eb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB01 5436 bytes
SHA-256: 02cb1458b53b1537649f38aaddbcb9b80326b098d209c27b38e6a3ffcbf7a462
font_01_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 10688 bytes
SHA-256: c7200a8c3696eb62244584d6ded3d156d58191fa00c98acf52a6a0537919efba

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