Malicious PDF — malware analysis report

Static analysis result for SHA-256 cceab375819b564d…

MALICIOUS

PDF

64.7 KB Created: 2020-11-13 11:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 0901017a9db0309d29d5c4f54f0dd823 SHA-1: 26b278f87ebd24ed983a9e255e7fc20d1610a5a9 SHA-256: cceab375819b564daeeddfc4f1d7d2adef3b0c9e97f71b739a046d6b7b1aa119
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, including critical alerts for linking to known malicious redirector infrastructure and hosting a large link farm. The document's content, though obfuscated, appears to be a lure for users to click on numerous embedded links, likely leading to phishing or malware download sites. The primary attack vector is likely spearphishing attachment, with the embedded links serving as the mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/123?utm_term=greek+magical+papyri+spells In PDF document text
    • https://dawiganolakegoz.weebly.com/uploads/1/3/4/3/134367714/dijiwelajujekul.pdfIn PDF document text
    • https://dedaruxije.weebly.com/uploads/1/3/4/4/134455514/vikakituwisikuso.pdfIn PDF document text
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/8631945.pdfIn PDF document text
    • https://sekojufakov.weebly.com/uploads/1/3/0/7/130776719/e03581a647.pdfIn PDF document text
    • https://zuxuzesis.weebly.com/uploads/1/3/1/4/131438019/8047150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fa456ce155a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5fad7e366c5c8.pdfIn PDF document text
    • https://fopimakalegej.weebly.com/uploads/1/3/0/7/130738542/tebikeromotem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444356/normal_5fa66e09e6ca2.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/18045f5b-a49f-406f-a3d2-6eb218efcf02/bevozirunopidelajozil.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_off0000c13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13E 5452 bytes
SHA-256: 492ad3a85d285df94a1cbaaf63ea2d1c358b3af9ad216ca65ad73249b1853798
font_01_sfnt_off0000d3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C0 10144 bytes
SHA-256: 7c5d497edc3bb8e6099a8f41ce03296c22f445547538f6d9ba42c807069353ef

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