Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afd6cb6fd24bba1…

MALICIOUS

PDF

89.4 KB Created: 2021-01-06 13:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b70913e3e5cdbf96a005a3e054f76c45 SHA-1: 7437f9f699e4cd6023c7568b5e37dd2941fec8c0 SHA-256: 3afd6cb6fd24bba1ddf8a8dc745502e58fb348af8c466236c0c6b7b3fb905e03
274 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 brand-impersonation credential phishing and a malicious redirector link. The ML classifier also strongly indicated maliciousness. The embedded URLs point to redirectors that likely lead to credential harvesting pages, specifically impersonating Facebook. No scripts were extracted, but the PDF structure itself facilitates the phishing attempt.

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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/89f114a9436.pdf.
  • 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://cctraff.ru/aws?utm_term=chemical+reactions+quiz+review+sheet+answers In PDF document text
    • https://cdn.sqhk.co/gasawivu/u3jexii/lukizopozenutafemefud.pdfIn PDF document text
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/89f114a9436.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/gcYifie/41966427849.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/IkaiOhi/kutegalivojuwarof.pdfIn PDF document text
    • https://teriwogawuf.weebly.com/uploads/1/3/2/8/132815342/gimesolebata.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/41e7aa90-edc2-45e9-8d8d-1f96119b4de9/52157200927.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f836d3b8-9ecf-4f65-992f-38131138abb1/xunopimoganobidudaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aae9338d-3ec8-48a3-a57d-6dc9e04f67b0/29721212736.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/327ecc17-4f7d-466e-89d2-e3fe1a7f21a1/56021452394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17296cbb-0621-41a2-8fa6-1d6df1a54c55/cumberland_ankle_instability_tool.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25b3d7d-5e8d-40ba-b6cf-547cd7ac4154/4358988312.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a323c34-2839-4a17-8d0c-a0d6cb3ccc5b/28935757492.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_off00012497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12497 5272 bytes
SHA-256: 4b56bf1fc738d1c9f73b00423e9ad3df99911333ee76ef39e54c610dad7e56d3
font_01_sfnt_off0001366d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366D 10124 bytes
SHA-256: bcdcd4821ebd91c369d32604f13fd2ee5b83e9237b9614e5887ad2aab7fb50f2

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