Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bdbe8087a6b606…

MALICIOUS

PDF

68.6 KB Created: 2020-12-07 15:11:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a53f2df1cd1f0b8a8ebe0973454d4b1f SHA-1: 7bd83b0331c6fe795fec9a512e9904016fd1e9e6 SHA-256: a6bdbe8087a6b606b9aa540f993837c9caee7003ec9ebe6b9cdb7f7de9ab7283
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting or known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The document body, though heavily obfuscated, contains a URL that aligns with the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/aws?utm_term=latest+android+smartphones+under+15000 In PDF document text
    • https://joguwezur.weebly.com/uploads/1/3/4/5/134500750/mexubutezejoba.pdfIn PDF document text
    • https://lefamadagizid.weebly.com/uploads/1/3/4/7/134704745/tetefabarajowibigu.pdfIn PDF document text
    • https://mijebekebune.weebly.com/uploads/1/3/4/0/134017127/9781132.pdfIn PDF document text
    • https://vapufubewadul.weebly.com/uploads/1/3/4/4/134485241/6310776.pdfIn PDF document text
    • https://voperupazekeko.weebly.com/uploads/1/3/4/5/134505312/letoguverag.pdfIn PDF document text
    • https://lilikisewusufod.weebly.com/uploads/1/3/2/6/132682662/6178237.pdfIn PDF document text
    • https://gakifesobilale.weebly.com/uploads/1/3/4/5/134512030/7280691.pdfIn PDF document text
    • https://xogexemufak.weebly.com/uploads/1/3/1/4/131437987/f5938ae993d5266.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/d9be6b25-9133-4f53-9fd6-ed222eb3fd64/jazixisirixizimif.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc38541239b07229141ccc8/t/5fc8de06b0f45b2a3d305373/1606999558676/gin_rummy_plus_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/spatial_sound_format_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/bojevizomibezati.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf6796a371610b876ecf3/1606219386392/6474884296.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_off0000d169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD169 5428 bytes
SHA-256: 3fc632ff8997ebdf9fd3120320bd454a57b808d00721e2bf853dceff4c741ce8
font_01_sfnt_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 10000 bytes
SHA-256: 7122c8ef92a2d5dfa5a58402e24cfb0ff29fd81b6bcfa82c1a6ff293cfab8af8

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