Malicious PDF — malware analysis report

Static analysis result for SHA-256 083c88a664467cb2…

MALICIOUS

PDF

62.4 KB Created: 2020-12-19 15:41:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f761d10b2b5cbe900e4e4a0d34ef7dc SHA-1: ec8ced0a7894386b9523ce7b3b6f0fd281512f00 SHA-256: 083c88a664467cb22e3466223364c5a3cc05a14ee18b0e8701f78fad67615296
126 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that redirects to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, appears to contain metadata related to the URL's search term, suggesting a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffnew.ru/strik?utm_term=brevard+county+courthouse+phone+number
    • https://xemivigezeb.weebly.com/uploads/1/3/4/4/134481563/712fb39bc8cd2be.pdf
    • https://cdn-cms.f-static.net/uploads/4450625/normal_5fda7c12e420d.pdf
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/a807168.pdf
    • https://rumorima.weebly.com/uploads/1/3/4/3/134307849/3322360.pdf
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/9349505.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/wivibuwebekujex_segakib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fc97d3fb-84c6-49ad-ac42-7d918cbe028f/silepukoratifetatoz.pdf
    • https://uploads.strikinglycdn.com/files/626db320-d231-4d37-9a30-5bfcf983197f/sitexemedorojikimam.pdf
    • https://uploads.strikinglycdn.com/files/5e482d79-ec35-4925-9dbd-6b62fa2a14cb/7427760522.pdf
    • https://s3.amazonaws.com/rujabepifar/adeste_fideles_spartito_coro_4_voci.pdf
    • https://uploads.strikinglycdn.com/files/cc3ea04e-ed0c-460e-84dd-848b521f3bb6/losixinuwasuzijujinol.pdf
    • https://s3.amazonaws.com/fobupojowojon/deiform_web_template.pdf
    • https://static1.squarespace.com/static/5fc4f5382bbd740658208855/t/5fcf5a5d69d6d06d553f01e1/1607424606875/best_free_local_multiplayer_games_ps4.pdf
    • https://static1.squarespace.com/static/5fce1d253b4ad40d4a7f5bec/t/5fceb915e4d8f2662cfc5cd1/1607383317816/rollerball_2002_trailer.pdf
    • https://uploads.strikinglycdn.com/files/f74a17d6-e9b1-4344-a334-3b777f715956/exton_train_station_to_philly.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_off0000b7d6.bin
83974b5366714caa0ac8de87ab2bf99fcb1b2150e9aa2ea3d212b8063eb67bb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D6 5632 bytes
font_01_sfnt_off0000cadf.bin
882dd6e3058b2cf2af7d6df0136b5a880608e2ed39e4e45e7fd320f077665a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCADF 9928 bytes

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