Malicious PDF — malware analysis report

Static analysis result for SHA-256 5732c0f7782168b5…

MALICIOUS

PDF

112.7 KB Created: 2021-03-14 20:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d9bf86dbfffafcea183193976a253b04 SHA-1: 9a3751eb0806665a08b794c2b7e53f5a491e8fff SHA-256: 5732c0f7782168b5d3c8d62641a19c71c6ac762b7ee8c95f744ffe4eeddbea96
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 numerous embedded URLs, with a notable heuristic indicating it's a link farm on disposable hosting, pointing to suspicious domains like seumenha.ru and fb-ig-copyright.com. The document body, though heavily obfuscated, suggests a lure related to a specific PDF topic, consistent with phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest an attempt to redirect the user to 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://seumenha.ru/award?keyword=modelo+neoliberal+en+honduras+pdf PDF link annotation
    • http://fb-ig-copyright.com/65055103314iajas.pdfIn PDF document text
    • https://cdn.sqhk.co/jokalirubore/Yjgjdgc/mizix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417226/normal_5fc9ed7fdee3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382004/normal_6033c9f33df6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_603178a573d87.pdfIn PDF document text
    • http://itfamily.info/kiragideletanakudanmywr.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/xLjiUsL/with_heroes_idle_rpg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_5fd795a3d8c9a.pdfIn PDF document text
    • http://usejus.club/43196635810n726q.pdfIn PDF document text
    • https://cdn.sqhk.co/wawerugile/hc8D06z/83832297664.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/safago/animated_movie_maker_apk_free.pdfIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_0d558e79a8064b19830ba934ec786d3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godewumazek/tuvipileremev.pdfIn PDF document text
    • http://worubigux.epizy.com/ruwikerotewuniwejewikeg.pdfIn PDF document text
    • http://sunapasu.epizy.com/yoga_for_fat_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/jafiko.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/banquet_server_training.pdfIn PDF document text
    • https://49b7c339-fea6-4bb3-bf7b-ca47af5263df.filesusr.com/ugd/6ca12d_f1df3bb4dcde477d8c87d4996b0de53c.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_7c2cd6d0af3741cea15baa00937df239.pdf?index=trueIn 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_off0001796f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1796F 5272 bytes
SHA-256: a1f2de36ee00279706e40c07dba0c8e40f47dccc90eee86504f4d6587f7c755a
font_01_sfnt_off00018b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B59 12392 bytes
SHA-256: 2d34563aad1cc98052ee99763c5acc60b4ebd7f0eb2c7b01b5ff677634436000

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