Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbfaa0c63d1ab69…

MALICIOUS

PDF

69.6 KB Created: 2020-12-17 21:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 0a10355fc689f48a8b3a885966237372 SHA-1: ce8331bab15214a8c1fa2d95e6cef42ff9ffc3e4 SHA-256: 9cbfaa0c63d1ab698e3aa3b8a6a33cf0252208bec0bff57a2abdcf66abbf7b1b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to a 'technical resolution'. The presence of numerous external links, including one to 'trafficel.ru', suggests an attempt to direct users to phishing or malware hosting sites.

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
  • 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.
  • 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=resolucion+tecnica+538%252F18 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402501/normal_5fa65da63fd83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fad948a08982.pdfIn PDF document text
    • https://pojarepuvoweru.weebly.com/uploads/1/3/3/9/133999230/wavomer.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/2590714.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5fc539a51cf59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_5fd911c506f5a.pdfIn PDF document text
    • https://gegixigozazewit.weebly.com/uploads/1/3/4/8/134858275/7168237.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469641/normal_5fac491dc025e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_5fd62c7f16427.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/853cf.pdfIn PDF document text
    • https://zuxibonidape.weebly.com/uploads/1/3/4/8/134889984/zibuvefu.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/8fcb4d0a-f64c-4a4a-9c53-03441a47542e/14409324617.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/angry_birds_epic_hack_tool.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f4078787e879896c419e/t/5fc6c40ec7c45a5eaf903118/1606861839079/xebop.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_off0000d23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23D 5272 bytes
SHA-256: dc03b4ae5c1e7f0efc84c78583051b4e066f30ced0b0e279ab86688fcf8a526d
font_01_sfnt_off0000e454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 11160 bytes
SHA-256: 1b8ff0bc1d30e22913dee1798062417a310a0f94074f412fa1d1dbc98161d19c

Open this report in the interactive analyzer, or submit your own file for analysis.