Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62f94538b1afab3…

MALICIOUS

PDF

76.1 KB Created: 2021-01-13 09:27:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 05dd3bf957660cca4e9a1158d3d6017c SHA-1: 78576cda071b4a97c0594ebce5ef032919850167 SHA-256: e62f94538b1afab3efcc87a75a95a9ecf20c4ddb9c8ac55d4b55630cb79d1168
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged for linking to known malicious redirectors and acting as a link farm on disposable hosting. The embedded URLs likely serve to distribute further malware or lead users to phishing sites. The document's structure and numerous external links suggest a coordinated effort to manipulate search engine results or distribute malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=personajes+importantes+de+mexico In PDF document text
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/nujudavegakevilebeko.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366364/normal_5fbad1bca350f.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/dgiiaeS/here_we_go_again_mamma_mia_netflix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8ab2222b4c5.pdfIn PDF document text
    • https://gamuzajebi.weebly.com/uploads/1/3/4/4/134481120/sepekogewinivomom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383445/normal_5fb6dc969ce17.pdfIn PDF document text
    • https://letezinujafi.weebly.com/uploads/1/3/4/9/134901841/3860867.pdfIn PDF document text
    • https://mirepabokotixiz.weebly.com/uploads/1/3/2/7/132712407/a8350fe5970e831.pdfIn PDF document text
    • https://merezedul.weebly.com/uploads/1/3/0/7/130739463/konivew.pdfIn PDF document text
    • https://zokilare.weebly.com/uploads/1/3/4/7/134767859/6516472.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 5120 bytes
SHA-256: 144dc60109165d78a3d0a64e45f86c06469abf5c578cf6ad06f1f74371a60be7
font_01_sfnt_off0000f044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF044 10800 bytes
SHA-256: 82c9b68f04f1a3880d982becb2e363dd45a09232ebf2840806f5b2911b5a3925
font_02_sfnt_off0001139c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139C 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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