Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2c1ef9d9e73e93…

MALICIOUS

PDF

76.4 KB Created: 2021-01-16 10:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 86d893b2173f8eed04109574216d70b4 SHA-1: 7d8deb88731097437ee7e9a8ef1c2f3db80e72ce SHA-256: 1f2c1ef9d9e73e9304ea08abac0276abc723eda7a7f888fb674cc714a7a94b03
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier as malicious. It contains multiple embedded URLs, with a primary suspicious URL pointing to 'trafficel.ru'. The PDF structure and embedded content suggest it's designed to trick users into visiting this external link, which is a common tactic for phishing or distributing further malicious content.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/123?utm_term=booster+seat+table+high+chair PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4466367/normal_5ff1e551c2bf7.pdfIn PDF document text
    • https://site-1247186.mozfiles.com/files/1247186/backtrack_full_movie.pdfIn PDF document text
    • https://wekisakalew.weebly.com/uploads/1/3/4/6/134617168/bapumabesenejasob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490917/normal_5fd9050e97d71.pdfIn PDF document text
    • https://site-1177175.mozfiles.com/files/1177175/xosijav.pdfIn PDF document text
    • https://site-1168179.mozfiles.com/files/1168179/22738222554.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/1535559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_5fbd1bc49d2ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_5f9458b3a49fc.pdfIn PDF document text
    • https://sezariserafuf.weebly.com/uploads/1/3/4/6/134673330/6126685.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/fatisake/kegaradobesujerovebalomo.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/bosch_integrated_dishwasher_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/fezuro.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_off0000ed9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9A 5252 bytes
SHA-256: 24800b3b0618f87f5e37534c0ff5b1286f181b5ed3632ef9c54273b9d1fe33ef
font_01_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 10972 bytes
SHA-256: dea885bab4f5d3c6b8f557e4a700f9b977a83b10c758a859642bf9b9e2770505

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