Malicious PDF — malware analysis report

Static analysis result for SHA-256 b321ae927f3051ba…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 20:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 280bb154138022ae74818b0229027472 SHA-1: 4ff582a60fa0fc86df49217b3cff119d0434ba13 SHA-256: b321ae927f3051ba508feea6e3db3a72fd5c2d1e0c074a440b1a6f1b0db1a738
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'pixomot.ru', suggesting it's designed to redirect users to potentially harmful content. The PDF structure also indicates it functions as a link farm, likely to obscure the true destination or spread malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pixomot.ru/uplcv?utm_term=hidden+call+recorder+app+free
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0b0ce34a14c4625f2c4733e3d2fe7162/boneguxixovepuwapadipefaf.pdf
    • https://ltes2.tw-goods.com/UserFiles/files/30671736894.pdf
    • http://ck-kutnahora.cz/gais/image/file/buwozuzeporuwujizu.pdf
    • http://phonphangschool.com/upload/files/koxumomudutivaxeko.pdf
    • http://sahcarpets.com/userfiles/file/vukisikutotuvadiverasumo.pdf
    • http://homestationrealty.com/userfiles/files/95521049708.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9da8918c9---20558623552.pdf
    • http://oroblupiscine.it/userfiles/files/kuxuwogudenuw.pdf
    • https://vinamex.info/uploads/news_file/15204547715.pdf
    • http://ccforum.kr/uploads/file/1631342734.pdf
    • http://vanhacollection.com/images/files/96728215525.pdf
    • https://locktactyuma.com/ckfinder/userfiles/files/jidonagetun.pdf
    • https://luatsuavina.com/userfiles/file/roniravodititaropaje.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/bikemiwaralaxomasugovuxuz.pdf
    • http://associazionemillesogni.it/userfiles/files/lajagimetubusemesuxevag.pdf
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/puzen.pdf
    • http://suliaox.com/v15/Upload/file/20219754517254.pdf
    • https://sabresources.com/FCKuploads/file/49452174394.pdf
    • http://abwplazaview.com/uploads/files/54717074633.pdf
    • http://childconnect.com/swi/fckfiles/file/zagebegibizizutijonux.pdf
    • http://technoprofile.ru/userfiles/file/mimuwasibesebugifogasa.pdf
    • http://beachfirebrands.com/userfiles/file/bekowoxoti.pdf
    • http://millionsdiscount.com/mo_images/files/nivususidejunazutu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
font_01_sfnt_off0000ea41.bin
c2074fcd00313f9c4dd225290b6697b4a89c36a47c50444c49704f9e01d80b00		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17072 bytes
font_02_sfnt_off000115e1.bin
c9ec00f8330ffb4df8832f39975e6246cb5ca6fe649ce75a9503de069b4879ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 10340 bytes

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