Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb90e3accccfe29…

MALICIOUS

PDF

77.4 KB Created: 2021-04-02 07:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4d38175d74229857c29d5f068382d0a7 SHA-1: 886277ae94b8ea883eba6d089dc5a244620808d4 SHA-256: 2fb90e3accccfe299ba43522bac64a67e98cd94484dac31cce21a2744ea0e655
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting services and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a 'Mysql tutorial for beginners'. The presence of external URIs and the overall structure are indicative of a phishing campaign leveraging a document as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/strik?utm_term=mysql+tutorial+for+beginners+with+examples PDF link annotation
    • https://cdn.sqhk.co/nuzinipaz/icghBp1/translate_english_to_spanish_slang.pdfIn PDF document text
    • https://cdn.sqhk.co/liwifetil/ajRheKH/46050765865.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/ec5381b39ed9a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_601563953bf71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407983/normal_601b749f54ca6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374835/normal_5fcd6579cc1b2.pdfIn PDF document text
    • https://luvisusarav.weebly.com/uploads/1/3/6/0/136011852/5229725.pdfIn PDF document text
    • https://kuvijoxujav.weebly.com/uploads/1/3/4/2/134266993/lixuzotajuxirin-dojade-jefomamabipexof-xexosen.pdfIn PDF document text
    • http://f13x.xyz/vavonxnq3s.pdfIn PDF document text
    • https://japipimimobuxi.weebly.com/uploads/1/3/1/0/131071183/vesused-pizabojami-bapovamavijo.pdfIn PDF document text
    • http://thiswaytovogue.com/43322235672kl6kp.pdfIn PDF document text
    • http://mrshadow.net/biomagnetismo_mdicod5k7o.pdfIn PDF document text
    • https://kezeminitiwo.weebly.com/uploads/1/3/4/4/134476020/vafosadajarus.pdfIn PDF document text
    • https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/3178a7b40.pdfIn PDF document text
    • https://wijununag.weebly.com/uploads/1/3/1/4/131438003/e172372425f574.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470833/normal_60049654c0e9b.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/WmGOJhh/monkey_d_luffy_age.pdfIn PDF document text
    • https://judadumoxa.weebly.com/uploads/1/3/4/7/134718892/9c8108be259e1.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/nosepevozux/73965689617.pdfIn PDF document text
    • https://s3.amazonaws.com/xenavuxa/66930555325.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/dc_adventures_universe.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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 5848 bytes
SHA-256: 2469f4ba5f0e63db715e49faea6e5f00fcd6a6137dcc14c2df505b1f7b7a6db7
font_01_sfnt_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 10420 bytes
SHA-256: bfdab1675c2a6df2707d3dd01f886339dce7b5142207a06bcea0db6f07203c96

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