Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f1f7b236c581d7…

MALICIOUS

PDF

72.7 KB Created: 2021-02-14 04:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: a66bba97a520c0583b4f6c9415a9db23 SHA-1: 35e3eec6785dd171b5f9c94351968bb03ae99239 SHA-256: a6f1f7b236c581d7f24539e5ccc8560a5cd3b4d5d8331d2972dd993d4809a93e
126 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users. While no scripts were explicitly extracted, the presence of embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution attempt.

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://leonvi.ru/wix?keyword=el+verbo+ser+-+explanation+and+practice+2+answer+key PDF link annotation
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/wakamofimu.pdfIn PDF document text
    • http://riniwovefaraw.22web.org/25526796395.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/zofimip.pdfIn PDF document text
    • https://cdn.sqhk.co/vezubusevof/hjhhsgC/vonikiloxekepone.pdfIn PDF document text
    • http://daating19.site/flight_simulator_2018_flywings_android_1af99t.pdfIn PDF document text
    • https://pevidutapare.weebly.com/uploads/1/3/0/7/130740538/mopejerowa.pdfIn PDF document text
    • http://uuuuull.space/75585751582hrqpc.pdfIn PDF document text
    • http://pijitirade.iblogger.org/14327146046.pdfIn PDF document text
    • https://xapewagese.weebly.com/uploads/1/3/4/3/134314981/aaed47c.pdfIn PDF document text
    • http://shishkin-seed.xyz/diamond_rush_temple_adventure_stage_2_level_2tr7jh.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/dvrjjsS/cross_bridge_cycle_diagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gugujis.epizy.com/xuxefitosov.pdfIn PDF document text
    • https://s3.amazonaws.com/nevowimo/6952128889.pdfIn PDF document text
    • http://pemukusa.epizy.com/angular_template_reference_variable_properties.pdfIn PDF document text
    • http://zazujipediwa.rf.gd/84039461664.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_off0000dd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD25 5712 bytes
SHA-256: 85606f43babeab95de43c7d13f0eafb51daf8e22bcdee101368031c4dd942f15
font_01_sfnt_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 10656 bytes
SHA-256: ff4bafbdfb3415764b384c39a1e6f01426f27d0fd761780ffb388b727255d181

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