Malicious PDF — malware analysis report

Static analysis result for SHA-256 f96ea86ed1ecef74…

MALICIOUS

PDF

76.8 KB Created: 2021-03-18 12:43:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: d4138cba4ce20c5a2b2a713ae6aad900 SHA-1: ef55575aa9dc3edc19dfb67de784ea4d9b7395d1 SHA-256: f96ea86ed1ecef74604e7fe0f94412e247746ad2016d050ee1400e11b00614e2
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it's a link farm and uses social engineering tactics ('ClickFix') to prompt the user to run commands, likely to download a secondary payload. The embedded URLs point to suspicious domains, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xajibur.ru/123?utm_term=chrome+via+terminal+ubuntu PDF link annotation
    • https://tabajojimito.weebly.com/uploads/1/3/4/3/134317549/9635242.pdfIn PDF document text
    • http://vegefojafi.22web.org/the_art_of_electronics_horowitz_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/XMgjigs/zombie_headhunter_knife.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/egc1Wib/facebook_login_homepage_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/nazixasinuti/kohfhyj/47629107773.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/seneburijapu.pdfIn PDF document text
    • https://genizeregadivov.weebly.com/uploads/1/3/4/7/134709948/pugepe.pdfIn PDF document text
    • http://rirenanevigi.22web.org/passive_voice_reporting_verbs_explanation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503787/normal_604adbeaa448d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421778/normal_6020ff0cd2ada.pdfIn PDF document text
    • http://ratapadeko.22web.org/john_deere_l130_steering_parts_diagram.pdfIn PDF document text
    • http://vofokifuzujusi.iblogger.org/rovoribigur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://mitefarosut.rf.gd/wamavotejupad.pdfIn PDF document text
    • http://motakajukig.epizy.com/vasifilenefobib.pdfIn PDF document text
    • http://dogefifuga.rf.gd/79157403596.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/watch_son_of_god_123movies.pdfIn PDF document text
    • http://vivavopiz.rf.gd/aerodynamics_aeronautics_and_flight_mechanics_mccormick_free_download.pdfIn PDF document text
    • http://wijobave.epizy.com/48495005364.pdfIn PDF document text
    • http://surubaf.epizy.com/biografia_de_baldomero_lillo.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_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 4852 bytes
SHA-256: fbe6ec8064a34e6e980f88735365f695185a7993562a68b7fc61c34e0b912311
font_01_sfnt_off0000f2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A5 10924 bytes
SHA-256: a0fef8b06d9ecea0e3c9a85cb493f29c9a253b955f5ccd288ce382555e37d481
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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