Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e273079f5b67ca…

MALICIOUS

PDF

61.7 KB Created: 2020-11-24 09:27:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 99776dabe1ce59774161f6c6672073cb SHA-1: 64394bb7203d29da09d1c03b1e2b2d62a74a94cb SHA-256: a7e273079f5b67cad249ee22b6aefadd78bef5ce974c547688ec9ecc7e3fd87e
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 of which point to external PDF files hosted on various platforms, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ggtraff.ru), and ClamAV detected the file as a phishing trojan. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection strongly indicate a malicious intent, likely to redirect users to phishing or malware distribution 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/strik?utm_term=tinto+brass+fermo+posta In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_5fb4da9f8a1af.pdfIn PDF document text
    • https://vubinejenifa.weebly.com/uploads/1/3/4/4/134444695/zugufurexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_5f94e5b21cff5.pdfIn PDF document text
    • https://joxenawofin.weebly.com/uploads/1/3/4/3/134342561/5aa729dfc7.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/1362824.pdfIn PDF document text
    • https://nafuxiba.weebly.com/uploads/1/3/4/0/134097784/fubeludamepame_julejofaz_logiderepixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413474/normal_5fb7a87c9717c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f896d5fbd8e8.pdfIn PDF document text
    • https://mugilofovoki.weebly.com/uploads/1/3/4/6/134616553/manonit_banasibagodi.pdfIn PDF document text
    • https://giximelet.weebly.com/uploads/1/3/4/2/134234701/9654a6c761.pdfIn PDF document text
    • https://gujodoludota.weebly.com/uploads/1/3/2/6/132681740/pogedemuboxosoz-gakivetatox.pdfIn PDF document text
    • https://kejifesabateg.weebly.com/uploads/1/3/4/8/134847793/fadec7.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/dotivaf/relative_pronoun_worksheet_german.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/dapejerakomeneweju.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/resiwapanifomikine.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/31042507050.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/game_bike_blast_mod_apk.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_off0000b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 5104 bytes
SHA-256: 0a7c7710e964a52495d8994b339be9440756f92b4ad80a5bc2b0d81fb61a803f
font_01_sfnt_off0000c5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5CE 10580 bytes
SHA-256: aff665ac676d98e478dd52823a18c3bf9eafb2505991db518ec85149c645e88e

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