Malicious PDF — malware analysis report

Static analysis result for SHA-256 282dc7d4c4c9fecf…

MALICIOUS

PDF

83.4 KB Created: 2020-12-15 23:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c5bf6c38a6e59165de9e5a3d1ef4bdc SHA-1: 7bd6b135a2548268ea3aeefd31ac6e12ac355828 SHA-256: 282dc7d4c4c9fecfa01a3d6f8bf3a799b4777abf3558578ebfb4b389a77fab17
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm designed to distribute malicious content or phish users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. While no scripts were extracted, the structure and heuristics strongly suggest a malicious intent to redirect users to harmful sites.

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
  • 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://ggtraff.ru/123?utm_term=thaumcraft+research+helper In PDF document text
    • https://botofemuko.weebly.com/uploads/1/3/4/8/134891122/sezesobufe.pdfIn PDF document text
    • https://gobumireg.weebly.com/uploads/1/3/1/3/131383916/zixaxasigesaja-vulokigimo-vosesotup-bizunujanawofud.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/jojazuvuxesifu.pdfIn PDF document text
    • https://nujelojebalu.weebly.com/uploads/1/3/4/6/134690198/rijelovogejibil_pibowof.pdfIn PDF document text
    • https://wanuwoziburake.weebly.com/uploads/1/3/4/4/134458428/1417649.pdfIn PDF document text
    • https://xomowapiwaliv.weebly.com/uploads/1/3/4/0/134000086/bd4658380b9.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/4cb5048d-320d-46f5-b11a-15511b1db5ec/fisalilidunadisiwuwuz.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/best_formation_atletico_madrid_fifa_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c8c2232-aabb-47f0-ac12-1bd95460d3e4/lizovek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e377da3-4118-452f-b4eb-ae7ba9cd063b/pegokagaparosuvowobaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10b51305-55c1-4561-8a9a-a83700a53a4c/66240063174.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/le_banquier_livre.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_off000109f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F2 5204 bytes
SHA-256: 0578e87bab1c78e6131423e8cebddaf3429e121c3fa9d6b1ce662f8f56208bbd
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10936 bytes
SHA-256: 01eb6e069cb72ea04638aa2478b1ae8aac947a0bacf554168721c40a15bcd871

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