Malicious PDF — malware analysis report

Static analysis result for SHA-256 eab391e2dc8f9598…

MALICIOUS

PDF

76.7 KB Created: 2020-11-26 06:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1808312747089271f41a2ee2f731a176 SHA-1: 8bd164038e3086aaaa3713957c10e44b9bb326ac SHA-256: eab391e2dc8f9598b46dd6275ee6032bfb9ee7ef885d1766ad0d1da98edd2bea
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The presence of multiple unknown reputation URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffking.ru/123?utm_term=comment+in+latex+matlab PDF link annotation
    • https://rebolotor.weebly.com/uploads/1/3/4/3/134364816/sifudogegunoxi-memineloxaxumos-dalutabamamuju.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/ac1e7b346f228.pdfIn PDF document text
    • https://zuvubexusemeto.weebly.com/uploads/1/3/4/3/134373725/9925200.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/7582b93cb050cc.pdfIn PDF document text
    • https://sujibume.weebly.com/uploads/1/3/4/4/134442643/c72789b6.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/78932df.pdfIn PDF document text
    • https://tesazosutev.weebly.com/uploads/1/3/4/7/134714215/nikifak_kovapazumes_fapulexililopaw.pdfIn PDF document text
    • https://zasetumodoroba.weebly.com/uploads/1/3/4/6/134692621/9ff3a3d7398890.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/58b9fcb6-684b-4b68-b9ec-b2ed1f92395e/vojobok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59c8ef98-e62b-4fb2-a742-b9bfdf4c7049/vetifilitirepemufoduwopum.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/prps_fit_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8b2436-2230-4185-995f-4bfe9ea173e8/31046442132.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5aa692-8890-4c91-ab11-bbf9bf345bcc/horton_pour_les_marchandises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ee4920-9c11-4cc2-84ab-5c6191ef89f5/jukuzapu.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/waiting_for_meme_generator.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_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 4672 bytes
SHA-256: f95f9df66950288fcd8950ac79f09dae93a4590cdc6ac2416c0ab18455ec6e2f
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 12644 bytes
SHA-256: ed4e6f86e6fc3ac3ac99ed309e396d7b52cfc2093cb54f4fe839fea7c5f33f13

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