Malicious PDF — malware analysis report

Static analysis result for SHA-256 6699cf630bea1177…

MALICIOUS

PDF

72.3 KB Created: 2021-03-04 07:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: c74de2876dc0fd12774f2beb96f89475 SHA-1: 230108cf3b66920ecc1cfedf13c38f09f58ce049 SHA-256: 6699cf630bea1177f008976645ba35f782ba4f2eec061aaa838484732ab2c161
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains references to 'GRE test practice questions', indicating a lure to trick users into visiting these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=gre+test+practice+questions+pdf PDF link annotation
    • https://cdn.sqhk.co/poronujefino/daPGhhG/23986985860.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467274/normal_5fe0f137cf001.pdfIn PDF document text
    • https://cdn.sqhk.co/midipumep/jbBMOid/ncert_class_9_physics_chapter_1_extra_questions.pdfIn PDF document text
    • http://tikovg.xyz/affective_neuroscience_downloadwepw6.pdfIn PDF document text
    • http://brettlockhart.com/jomibegovbaam6.pdfIn PDF document text
    • https://cdn.sqhk.co/rekewuneboxu/hvjd8gi/13185681535.pdfIn PDF document text
    • http://mazafaka69pussy.online/que_es_control_de_signos_vitales_en_enfermeria3ycnq.pdfIn PDF document text
    • http://dsv-trening.ru/samusagamazifamugvnn3u.pdfIn PDF document text
    • https://cdn.sqhk.co/mewivupa/XiizvJi/ninja_arashi_apk_mod_money.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/libeganot/can_i_use_synthetic_oil_in_my_toro_snowblower.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/94300453125.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/parukeg.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/38473349270.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/britannic_fs_bold_font_free.pdfIn PDF document text
    • http://sulijugofogim.onlinewebshop.net/how_do_u_describe_a_rainbow.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_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5276 bytes
SHA-256: 5da4785fc8d44b6d6c871fca59398de9cc540fe6ad9e6356019ba8fcd9e2d4c6
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 10944 bytes
SHA-256: ec75079a68f028818bfd6828f3854733d102e3a0d46ca279a531cee0639c2d04

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