Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e1bff6b931d16e…

MALICIOUS

PDF

80.2 KB Created: 2021-02-13 13:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c5d31ebba9678dfa7e597add24e23a7 SHA-1: f92982a0e18379d1b0c644bea8d310c5812cfc66 SHA-256: 31e1bff6b931d16e39b41ea97c842c9a99151511162f4498e147767b7fafcdc5
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document contains numerous embedded URLs, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the nature of the embedded links and the ML classifier output strongly indicate malicious intent, likely to lead the user to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://crophysi.ru/wb?keyword=high%20friction%20rubber%20sheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5fd2abca16b9b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424331/normal_5ff9c09ebe819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460461/normal_600cc545dea82.pdfIn PDF document text
    • https://timifuxi.weebly.com/uploads/1/3/4/6/134676324/solore.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489259/normal_601130a666d6a.pdfIn PDF document text
    • https://fetesebi.weebly.com/uploads/1/3/4/8/134896421/494627.pdfIn PDF document text
    • http://maxapur.22web.org/anamika_movie_song_mr_jatt.pdfIn PDF document text
    • https://josuriwomevopi.weebly.com/uploads/1/3/4/7/134769094/8fc5cb699ea04.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/lufox.pdfIn PDF document text
    • https://cdn.sqhk.co/pexudolifa/geoWTge/22611936963.pdfIn PDF document text
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/088a274072.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/pululusodogi/90831947293.pdfIn PDF document text
    • http://negejigudakopus.rf.gd/short_distribution_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/66222578693.pdfIn PDF document text
    • https://s3.amazonaws.com/bejexe/bee_picture_94_percent_answers.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_off0001000d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000D 5000 bytes
SHA-256: db8bb8431a5888ee53815c13c8d041ec282d872a11173e92bca303b34957fe63
font_01_sfnt_off00011117.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11117 10320 bytes
SHA-256: 86b0f5b2da3bd7574ef11e5d65896545b3c44c24326395139ae93a8df1e10e2c

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