Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba94198a402d707b…

MALICIOUS

PDF

81.1 KB Created: 2021-03-26 08:56:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: f2349c8b3df01840be3b951c51e4ff36 SHA-1: d3b34220a5ed0874243c7f9d7111aa2350effe82 SHA-256: ba94198a402d707becfc5e7f42d2f02cdd054d3c20063ffe77543ed882e79b98
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and link farms, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to software downloads, suggesting a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/123?utm_term=batman+dark+knight+rises+mod+apk PDF link annotation
    • https://kuzigojuzomuw.weebly.com/uploads/1/3/2/6/132683135/7555049.pdfIn PDF document text
    • http://wegutamozeji.iblogger.org/13149107790.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/gdoDZRc/fish_game_for_cats_free.pdfIn PDF document text
    • https://rukufutuseju.weebly.com/uploads/1/3/4/7/134748195/5a586835.pdfIn PDF document text
    • https://xusofudubivo.weebly.com/uploads/1/3/0/7/130775679/5006165.pdfIn PDF document text
    • http://centerverifybadge.com/60492499517s5s8.pdfIn PDF document text
    • https://cdn.sqhk.co/xamowizaso/qV9iaHB/word_scramble_solver_2_words.pdfIn PDF document text
    • http://gloslides.com/dazewufkljy.pdfIn PDF document text
    • http://mademupo.22web.org/gps_call_tracker_app.pdfIn PDF document text
    • https://cdn.sqhk.co/nazopekujavi/ThaJSij/22007149913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_6059bfa2a0fdb.pdfIn PDF document text
    • https://cdn.sqhk.co/pufuxarabo/chkjhhg/free_video_editor_apk_for_pc.pdfIn PDF document text
    • http://nasty666.space/fluent_forever_chinesejv0vc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403429/normal_5fec672dd64be.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xerefigirusew.epizy.com/nerififipujugivide.pdfIn PDF document text
    • http://surafupomef.epizy.com/romeo_and_juliet_1968_bedroom_scene.pdfIn PDF document text
    • http://mamuwudusaxu.epizy.com/kaxoworevalizavuzoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 5452 bytes
SHA-256: 03b963144fdd2135b15ee882850afb4354227642a28d8146931e54b6be24810b
font_01_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 5356 bytes
SHA-256: 716d480a2f27b1a6197701a3f257a5418d628252f3b2c9485ba11311e20575fe
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10688 bytes
SHA-256: e9908c0bc507d1e031a0691ce1f864e87ab7c54dced9e249e19485542fdc884b

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