Malicious PDF — malware analysis report

Static analysis result for SHA-256 3886c43fe03e12b6…

MALICIOUS

PDF

82.0 KB Created: 2021-03-28 00:58:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3279159220dc2525b44a47538074daa0 SHA-1: b777afba756a03bd87134fa9c72841c3bb3da86d SHA-256: 3886c43fe03e12b64eea7f3420979d205ca9674d7ad1f305455f5be5c99bbcbc
96 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 or trojan. It contains an embedded URI pointing to a suspicious domain, which is likely part of a phishing lure or a download redirect. The document body, though heavily obfuscated, suggests a pretext of an 'assessment day verbal reasoning test'. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://vilenefex.ru/award?keyword=assessment+day+verbal+reasoning+test+pdf
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/3968716.pdf
    • http://xifasiv.getenjoyment.net/snapper_rear_engine_parts_list.pdf
    • http://vijexibat.mywebcommunity.org/how_to_connect_to_a_polaroid_bluetooth_speaker.pdf
    • http://arbitestpark.xyz/project_cerberus_1._4._5_apk_freenryzi.pdf
    • https://vewefididijos.weebly.com/uploads/1/3/4/5/134517371/10965727f4ef.pdf
    • http://yildirimotobursa.com/lesson_8.2_skills_practice_answers_algebra_2llraa.pdf
    • https://cdn.sqhk.co/rotonoba/bhgihia/bewigobikotagepasotev.pdf
    • http://gipogup.sportsontheweb.net/what_are_the_different_types_of_agile_methodology.pdf
    • http://tifetatujuvib.22web.org/68979565364.pdf
    • https://tujeliwavujojow.weebly.com/uploads/1/3/5/3/135304707/dewatasezijoloxag.pdf
    • https://cdn.sqhk.co/difixoruze/LKTrief/rally_championship_gamecube_rom.pdf
    • http://dapujabowigu.sportsontheweb.net/ethnographic_qualitative_research.pdf
    • https://cdn.sqhk.co/jememobak/hfjdchU/bad_day_at_work_meme.pdf
    • http://wekeb.space/65342504537fnk4f.pdf
    • https://pamesatigifimes.weebly.com/uploads/1/3/4/6/134639420/gakuxid.pdf
    • http://firstreadersclub.com/valores_y_principios_moralesrd8tm.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dazutun/86376582884.pdf
    • http://kajoxuf.epizy.com/51284188829.pdf
    • https://s3.amazonaws.com/makixibawumebol/shop_lease_agreement_format_in_english.pdf
    • http://gabigirinekib.rf.gd/jikugit.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_off0001016b.bin
facfdb936429f9565f76a0b5c27eb1477574905947c88af9bab979992bb6b8a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 5652 bytes
font_01_sfnt_off0001149c.bin
862e6819380afa3f2d77a73406e95912e934a4b8e14d7e3df7d182ff6a5e2b9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1149C 10728 bytes