Malicious PDF — malware analysis report

Static analysis result for SHA-256 91b828f9c2417034…

MALICIOUS

PDF

80.8 KB Created: 2021-04-12 00:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da3e206b4784245c0fd40cb4d7f51bc0 SHA-1: 2aebca34146464555d700d40e4a6d6bc914c9ecc SHA-256: 91b828f9c2417034fcb15655fcd81b4517c5f4b7ecc21599e1831bf28b749af4
166 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains multiple external URLs, one of which is associated with a link farm on disposable hosting, suggesting an attempt to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious, supporting the overall assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://zajinet.ru/strik?utm_term=what+is+the+cost+of+a+deed+of+trust
    • https://static.s123-cdn-static.com/uploads/4380229/normal_5ff9d7edbf6d3.pdf
    • https://cdn.sqhk.co/vizelupavew/h3icig7/university_of_montana_jobs.pdf
    • https://cdn.sqhk.co/kejalupegem/jiNggHg/tolufurefesufapar.pdf
    • https://sonujeti.weebly.com/uploads/1/3/0/9/130969686/durikedogiposom.pdf
    • http://hayatevesigar.online/18156046663whxbl.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_603d73c63ab47.pdf
    • http://olymp-trade.top/amiri_garibi_picture_videomq32v.pdf
    • https://static.s123-cdn-static.com/uploads/4464878/normal_5fc6dafd281c5.pdf
    • https://bizawipogimiwa.weebly.com/uploads/1/3/4/3/134316434/mumixozepomola.pdf
    • https://cdn.sqhk.co/wopeporamo/ciahghb/50137196050.pdf
    • https://ronogutelujevur.weebly.com/uploads/1/3/5/9/135956648/11eab0e32ad.pdf
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdf
    • https://cdn-cms.f-static.net/uploads/4378378/normal_606cf8b15ff39.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fojeropiralamab.rf.gd/how_to_connect_logitech_wireless_keyboard_mk520.pdf
    • https://s3.amazonaws.com/nigimul/2016_cadillac_escalade_cue_manual.pdf
    • https://s3.amazonaws.com/nisiwanolom/cfa_level_1_book_3.pdf
    • https://s3.amazonaws.com/fejenijovekozu/who_played_sheriff_of_nottingham_in_robin_hood.pdf
    • http://sedunadilame.rf.gd/cover_letter_for_cv_examples_south_africa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c0.bin
00c636c0dfc96a07e9a983a09a37eab9039455336ddc4aed1b1923df044050c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C0 4864 bytes
font_01_sfnt_off00010367.bin
99c738d798f97c7f7830938597449ac0c40c0782d3d48ec9f3b4a61718deae57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10367 10732 bytes
font_02_sfnt_off000127fc.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127FC 4324 bytes

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