Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54b8233bb0b4d71…

MALICIOUS

PDF

74.0 KB Created: 2020-12-30 05:41:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c5eaec214c56c4a5da6439c941e0a633 SHA-1: 3737758ebb5e039e4137f6b456ffd0e07c19d7d0 SHA-256: a54b8233bb0b4d71ba2591b374a7ca99885dc46dafccdd39e306b2b5a997652a
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external links, with a primary suspicious URL being traffffe.ru, likely serving as a lure. The document body, though heavily obfuscated, suggests a theme related to a game, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links points towards an attempt to redirect the user to a malicious site.

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://trafffe.ru/strik?utm_term=asphalt+nitro+gameplay+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374853/normal_5f91fa5d2be07.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fcdbca444c4f.pdfIn PDF document text
    • https://zikenanevo.weebly.com/uploads/1/3/4/5/134589255/be780aaeff57a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422385/normal_5fba2aa8740fa.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/fasaga.pdfIn PDF document text
    • https://debemalimuwu.weebly.com/uploads/1/3/4/3/134385929/4136223.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/WqghhjA/62446521624.pdfIn PDF document text
    • https://vidojibirulon.weebly.com/uploads/1/3/1/0/131070792/e55fd019.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/JmRvjg1/terraforming_mars_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/sozaxejiv/W5znhnr/lilebipanebibaxamad.pdfIn PDF document text
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/kowepozulokapo-daxaduxozun-direnediji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418746/normal_5fc6d9332f89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5fb3cfe599ced.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/wovitiku/bahubali_2_trailer_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/impulse_function_laplace_transform_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/zimivajegagi.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/knee_stretches.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_off0000e43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43D 5324 bytes
SHA-256: 50176189fc955b5104e7e6e6bf236379bd511434feb56709d4a0ccb169b8dfe9
font_01_sfnt_off0000f638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF638 10644 bytes
SHA-256: 4a3211a9b4bedd0828b1dd37225440d95d0511e3d1aeb616e5dd6fb00e51996a

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