Malicious PDF — malware analysis report

Static analysis result for SHA-256 285cc9e805f1b52a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-19 06:41:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a326536704d089c3b29034ce16e88c84 SHA-1: 94e1b74e80c7069e50e06ed1fcee5c586a86a40b SHA-256: 285cc9e805f1b52a2f9591c089800da67f4a69c328c647eb5a5810849f0430a9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=what+are+the+qualities+of+a+good+christian+mother
    • https://cdn.sqhk.co/talurelope/fgdiaw1/unblock_ball_block_puzzle_level_1200.pdf
    • https://kovirelumen.weebly.com/uploads/1/3/0/8/130873776/7547438.pdf
    • http://jiviruke.iblogger.org/7317496406.pdf
    • https://xivupofe.weebly.com/uploads/1/3/2/6/132681771/c7203382.pdf
    • https://cdn.sqhk.co/natefisaka/y6iggdD/whatsapp_plus_red_apk.pdf
    • https://dusibijerike.weebly.com/uploads/1/3/2/6/132695870/79b7e42120.pdf
    • https://vowipolijej.weebly.com/uploads/1/3/4/7/134713390/bevikat-senita-jeboruges-pisekazexifike.pdf
    • https://pojekemo.weebly.com/uploads/1/3/4/4/134469054/1609071.pdf
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/c862541.pdf
    • https://cdn.sqhk.co/ravuviwidi/jejisNa/59830232263.pdf
    • http://jupofara.22web.org/que_es_un_taller_artesanal.pdf
    • https://cdn.sqhk.co/zoluxoni/4ghanCs/27011948735.pdf
    • https://gajodiwu.weebly.com/uploads/1/3/4/0/134042407/b64e492d6f6e9.pdf
    • https://faxipanonuk.weebly.com/uploads/1/3/4/3/134352952/6541041.pdf
    • https://vafuxukosa.weebly.com/uploads/1/3/4/4/134440110/7574a4993622fb.pdf
    • http://vaxitowozi.iblogger.org/airbus_a330_aircraft_maintenance_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://153f2bed-3501-4ec5-9468-ed1987511f6d.filesusr.com/ugd/f67134_7c762688b29741aa811ab15ea41e5b3b.pdf?index=true
    • http://lojuwuwa.rf.gd/80937811343.pdf
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_af61526d42654dd8b922f80ddc4e4077.pdf?index=true
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_0552df2c51de49bfa942bb873853e144.pdf?index=true
    • https://uploads.strikinglycdn.com/files/de6aed56-f6ad-4750-be34-12cddd35aa37/sojourner_truth_aint_i_a_woman_speech.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_1b8565eb4b0e46f9b31b33b722c99553.pdf?index=true
    • https://uploads.strikinglycdn.com/files/cb780840-87fa-41a6-a94f-48108755b739/lines_of_symmetry_worksheet_grade_4.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_off0000f8c7.bin
824474f75117cb401e14ddb9e5172a3279194f143ce417696903741ded011929		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C7 5572 bytes
font_01_sfnt_off00010b98.bin
ae093f31f1ba1d33f9d1171a40d4af313867ffee3f96b56857b8e51d502fd472		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 10452 bytes

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