Malicious PDF — malware analysis report

Static analysis result for SHA-256 960d54be5f092fb1…

MALICIOUS

PDF

81.6 KB Created: 2021-03-05 10:41:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: de871bef359efde57e2a03f7e6eab778 SHA-1: b78f98a829176fa93eb39631db0f135575934f85 SHA-256: 960d54be5f092fb11ff7a16cd5be495684c6485b737d72d8bc1879fde0f74acf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with a primary external URI pointing to 'https://mezovuduw.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a coordinated effort to redirect users. Although no scripts were explicitly extracted, the nature of the embedded URLs and the phishing detection strongly suggest an intent to redirect users to malicious sites for further compromise.

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://mezovuduw.ru/strik?utm_term=lamborghini+gallardo+lp570-4+price PDF link annotation
    • http://nelitip.22web.org/62006751497.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/ehhnAif/racing_fever_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381752/normal_603763195f304.pdfIn PDF document text
    • http://jofosisajagov.iblogger.org/suwiwusibiruwulupizisad.pdfIn PDF document text
    • http://fipixavonusin.iblogger.org/can_a_sprint_samsung_galaxy_s9_be_unlocked.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/Gjf8jf1/56823060842.pdfIn PDF document text
    • https://cdn.sqhk.co/kivutuzo/gewhbj9/zufibafetesaj.pdfIn PDF document text
    • https://cdn.sqhk.co/puwidebudojo/hbggQHm/nuxalofemubop.pdfIn PDF document text
    • https://cdn.sqhk.co/pilozarager/jiiq5gc/ramimefirajilu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499653/normal_5feb9920e1e4f.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/xif7dPo/donkey_kong_game_online_ipad.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/juduk/pewotaka.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/fotiberisok.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/estructura_del_texto_literario_que_es.pdfIn PDF document text
    • http://sovupafol.epizy.com/algebraic_identities_worksheet.pdfIn PDF document text
    • http://pagikojezokatu.rf.gd/mazar.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/poweredge_r730xd_firmware.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/pesedot.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/zewuzisimokud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 5856 bytes
SHA-256: c0ed66ee653d3069eb0d61e11f735d10c096d40dc2894a701cf43cbdc439db19
font_01_sfnt_off0000f09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09B 16336 bytes
SHA-256: 0b45e31096e6c8bba71991a69eff578cbfceb9b1cd3e4d207138bb135bd846b3
font_02_sfnt_off000123d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D3 16144 bytes
SHA-256: d2d14ee152591f1391b9c182731dc81228c2f3de4d706c9bd7d93c14ae925181

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