Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f184665f3c0c4fc…

MALICIOUS

PDF

72.8 KB Created: 2021-05-17 06:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75331650763041dcd98e11cfa3c22107 SHA-1: 749c1f71410fb1709310b36d0809d1c3a3459aca SHA-256: 5f184665f3c0c4fc710d76f0ef8b81433dddc918ff5a1b0d17ce5e0135d21333
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=car+battery+in+side+by+side
    • http://priz24.site/power_electronics_questions_for_job_interviewutyyv.pdf
    • https://ziwupaxibupava.weebly.com/uploads/1/3/4/3/134379030/juzunetopitonexerat.pdf
    • https://cdn.sqhk.co/viwukepato/whaha7k/application_form_for_sbi_home_loan.pdf
    • https://lososegumupabi.weebly.com/uploads/1/3/1/4/131407698/golaxon_lizopu.pdf
    • https://cdn.sqhk.co/tozerutiwezu/Ohdjbhe/35929596458.pdf
    • https://nezasitize.weebly.com/uploads/1/3/5/3/135303973/8451286.pdf
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/70701b24b418db0.pdf
    • http://rollernefritmassage.xyz/2017_maserati_granturismo_mc_centennial_editionlsjy2.pdf
    • https://cdn.sqhk.co/wisivelu/ak7d3nP/31069511459.pdf
    • https://cdn.sqhk.co/vateviti/heujbgj/mekiwizu.pdf
    • https://pixamowogiru.weebly.com/uploads/1/3/4/5/134590731/64bd6b03.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fajujiju/action_sheet_swift_github.pdf
    • https://s3.amazonaws.com/wutezigojuxi/bibawananizutobisa.pdf
    • https://s3.amazonaws.com/dikobepibelun/jacuzzi_laser_225_sand_filter_manual.pdf
    • https://s3.amazonaws.com/napejaxosinages/avr_atmega2560_datasheet.pdf
    • https://s3.amazonaws.com/ligole/midopoxifufisonu.pdf
    • https://s3.amazonaws.com/zolerazowubow/i_am_that_girl_book_review.pdf
    • https://s3.amazonaws.com/ganubifirigevi/barood_1976_full_movie.pdf
    • https://s3.amazonaws.com/tamobalasu/dunkin_donuts_manager_jobs_near_me.pdf
    • https://s3.amazonaws.com/wamatasamegu/how_does_girl_interrupted_end.pdf
    • https://s3.amazonaws.com/levumoduf/55632784157.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_off0000e1da.bin
40843ca37eaa9a5ecc2d5f069a2beed7ba6fb3af57e6b7801e6b0bab4b2988ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DA 4932 bytes
font_01_sfnt_off0000f2ac.bin
fc74fa5b481d0f58ac69c94b5618a53d209fe19d2ee9921c33f39d2254cb0fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 10216 bytes

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