Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec9d13324370e4c…

MALICIOUS

PDF

75.7 KB Created: 2021-03-29 20:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6cdce090a57dd13beec64722953abe9 SHA-1: bde088b57bb0354b6f68c251d114fc777a00cab6 SHA-256: 0ec9d13324370e4c0f287753c9f81d9c3faef39ec24e5d905a906730bd9dd7ef
126 Risk Score

Malware Insights

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

The PDF document contains numerous links to disposable domains, many of which are disguised as legitimate files. The document body, though heavily obfuscated, appears to be a lure related to a common search query, directing users to malicious URLs like https://jumiwimov.ru/strik?utm_term=why+is+my+tumble+dryer+making+a+screeching+noise. This suggests a phishing or redirection attack aimed at users searching for technical assistance.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jumiwimov.ru/strik?utm_term=why+is+my+tumble+dryer+making+a+screeching+noise
    • http://damvglaz0.xyz/calvinism_vs_arminianism_debater4d7q.pdf
    • http://idealsit.fun/55936317498y76dn.pdf
    • http://yildirimotobursa.com/craftsman_8_gallon_wet_dry_vac_bagshqvey.pdf
    • http://saudiautoinsurance.com/samimia63mz.pdf
    • http://artdebug.site/pamefuvaxefinadejl9msn.pdf
    • http://dithetsen.xyz/buvowewj251.pdf
    • https://ludefojixik.weebly.com/uploads/1/3/5/3/135347049/6403535562e63a6.pdf
    • https://bagerinev.weebly.com/uploads/1/3/1/6/131636948/9336014.pdf
    • http://milanomoda-italy.site/castle_hustle_arena_strategyhnq0b.pdf
    • https://zuzumesagodufen.weebly.com/uploads/1/3/2/6/132695194/6783945.pdf
    • https://demuxovepeb.weebly.com/uploads/1/3/4/3/134311881/fukugasaxera.pdf
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/6a641952e843eee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bezorito/slope_math_worksheets.pdf
    • http://timarofata.epizy.com/chemistry_hsc_past_papers.pdf
    • https://s3.amazonaws.com/gurupixabogivaz/nolovevivamub.pdf
    • http://losagamadupo.rf.gd/70432514413.pdf
    • http://degejukifukux.epizy.com/38532412995.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e88c.bin
d842ad3520dad0ff2d8a30f50b0a05534d9d8752892d3341abeb0d9e1d2c7713		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 5672 bytes
font_01_sfnt_off0000fbbc.bin
d9f2ebe046182a22d7c9f35133be1ff8d87fd002f71cec3f3b7773db6d51fffa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 10428 bytes

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