Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6231ee77c8d2c86…

MALICIOUS

PDF

69.6 KB Created: 2021-01-24 16:50:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 739da94371d6f1ec058d629e1dec9fc1 SHA-1: c1167b4770e6545fb1697f4219eef502ebe4c0b7 SHA-256: a6231ee77c8d2c86251fac15642135a652a5e8b1810330079e767293b9ae1a07
186 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, with critical heuristics indicating it's a phishing lure for recovery secrets or private keys. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', suggesting it was generated by a tool. The presence of numerous external URLs, many pointing to disposable hosting, further supports a phishing or scamming operation.

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
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://maypoin.ru/wb?keyword=iost%20staking%20wallet PDF link annotation
    • https://cdn.sqhk.co/datolabevev/2iegjJc/22464829234.pdfIn PDF document text
    • https://cdn.sqhk.co/videmixolute/PijCnig/color_maze_3d_print.pdfIn PDF document text
    • http://copyright-notice-ig.com/42810053978dhxis.pdfIn PDF document text
    • http://1eyvgo.xyz/drones_attack_aramcop3go0.pdfIn PDF document text
    • http://legivupipofu.66ghz.com/51752027457.pdfIn PDF document text
    • http://mscgis.net/dialga_smogon_dp5ji5r.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/fhi4jeO/changing_color_of_text_box_in_wordpress.pdfIn PDF document text
    • http://fabulouss.space/56239679753q725a.pdfIn PDF document text
    • http://tersq.space/280366247888r4ae.pdfIn PDF document text
    • http://metinozub.iblogger.org/cda_book.pdfIn PDF document text
    • https://cdn.sqhk.co/fadejiweruw/iaLD2Tf/my_talking_pretty_girl_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/R9qMhbf/talon.pdfIn PDF document text
    • http://naturka.space/wegabegagotepalolapen9mk8i.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mejobu/78166241727.pdfIn PDF document text
    • http://kowotasube.epizy.com/wrist_xray_report.pdfIn PDF document text
    • http://zitilidi.rf.gd/59690555021.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/apple_watch_faces_nike.pdfIn PDF document text
    • http://dokedajonanumi.rf.gd/binary_codes_tutorial.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E2 4852 bytes
SHA-256: bf90cbf39c3b5765dac1833a1c5f17106885c98bbfaa27957e1c91275a3f2f9c
font_01_sfnt_off0000e392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE392 11096 bytes
SHA-256: e1eb813539d2fea66baa57198fd6e933165f0c425129907806809fb909d89fca

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