Malicious PDF — malware analysis report

Static analysis result for SHA-256 03b1a277ce8fc6a9…

MALICIOUS

PDF

71.6 KB Created: 2021-01-11 14:33:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5e1952a086e1b884d0f2d81c242f2d63 SHA-1: a9cf86325995d852c3efa08143a85e38c8e225de SHA-256: 03b1a277ce8fc6a94284de27dbed7cc5942fa0eac1eedc8bc56cda3cb92d269f
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://traffine.ru/wb?keyword=children', are likely used to redirect users to phishing or malware-hosting sites. Although no scripts were explicitly extracted, the PDF structure and the nature of the links point towards an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://traffine.ru/wb?keyword=children In PDF document text
    • https://cdn.sqhk.co/kavejufa/oiikj8j/jurassic_survival_island_evolve_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/chchdFp/noxozazubobowit.pdfIn PDF document text
    • https://rawadawopi.weebly.com/uploads/1/3/0/8/130874142/wuluxixawaturot.pdfIn PDF document text
    • https://site-1166687.mozfiles.com/files/1166687/lusepewojifonulidik.pdfIn PDF document text
    • https://site-1172834.mozfiles.com/files/1172834/fufaxenid.pdfIn PDF document text
    • https://site-1175154.mozfiles.com/files/1175154/fingerboard_game_basketball.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/4dHrbhd/dazapasiwuzupenone.pdfIn PDF document text
    • https://cdn.sqhk.co/ninujamezol/geFlhhV/jazagegofewubezelozave.pdfIn PDF document text
    • https://site-1187532.mozfiles.com/files/1187532/38124967319.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393511/normal_5f953a859d0b8.pdfIn PDF document text
    • https://site-1168511.mozfiles.com/files/1168511/77571554649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368489/normal_5f9b7aa9e7a50.pdfIn PDF document text
    • https://koxoganonigowup.weebly.com/uploads/1/3/1/4/131408343/894664.pdfIn PDF document text
    • https://cdn.sqhk.co/pizokifuxe/gjSVJ6S/setebawonowegifamovolam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B5 5744 bytes
SHA-256: b5c2eff5667569ef804a772296dd22f9aaf462b2679594f2cdfa5f59c78b7883
font_01_sfnt_off0000ea4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4A 11764 bytes
SHA-256: 7b00fca7427039886a867dd35f0ec8a5dbf03504012b881a752e6a424e1c5791

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