Malicious PDF — malware analysis report

Static analysis result for SHA-256 c65f7b557ed41e11…

MALICIOUS

PDF

68.3 KB Created: 2021-02-27 18:43:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 05c5f8523128b161c723d0a781207e49 SHA-1: a84687425d00f239c92bf7ca81e9fd3f4542c627 SHA-256: c65f7b557ed41e11d3a0f95b2f99303c69b29a56df7166c5beb9a520df776985
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable hosting domains, suggesting a link farm designed to redirect users. One prominent URL, 'https://botokaw.ru/wix?keyword=download+psiphon+handler+apkpure', indicates a lure related to downloading software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=download+psiphon+handler+apkpure PDF link annotation
    • https://gafepodaxo.weebly.com/uploads/1/3/4/6/134606739/dofosafinapi.pdfIn PDF document text
    • http://paganel.world/24369976760z060c.pdfIn PDF document text
    • http://pristav.pro/free_games_dx_ball_5frlsg.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/bowelesodejupe-lulevig-xizare.pdfIn PDF document text
    • https://pawomasa.weebly.com/uploads/1/3/4/7/134737305/9060701.pdfIn PDF document text
    • https://xozipirun.weebly.com/uploads/1/3/5/3/135324749/5372476.pdfIn PDF document text
    • http://uspeh.icu/ar-_15_exploded_parts_diagramfdh40.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/effective_communication_skills_training_activities.pdfIn PDF document text
    • http://pubggaming.online/bilorujokobu5v4e.pdfIn PDF document text
    • http://mnatural.space/phd_thesis_template_microsoft_word_2010nuc49.pdfIn PDF document text
    • https://filafibiwi.weebly.com/uploads/1/3/4/3/134316544/704ecbcb.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/nujuroxidifowala.pdfIn PDF document text
    • http://ogranifruit.space/xomulas1q5nn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/45213530649.pdfIn PDF document text
    • http://pulutugorivexek.atwebpages.com/sports_illustrated_swimsuit_models_kate_upton.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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 5200 bytes
SHA-256: 7ffd6f85e459a1bf5151b76e46b228b7b56ccb46325f57e2a3edda8dc32fa2ad
font_01_sfnt_off0000dc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC78 12504 bytes
SHA-256: 0d893708ac3f86ac9f2dea9087aa512f60911daa639c83326f2d7c731ddf38af

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