Malicious PDF — malware analysis report

Static analysis result for SHA-256 efed300fce012a3f…

MALICIOUS

PDF

80.6 KB Created: 2021-02-27 11:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 26f03bf933f40f1c5704f80dd4a616d8 SHA-1: f22c350236190509a3792b9740340c0b907437b3 SHA-256: efed300fce012a3f56554540cb87dc6ffd5f3db60777b8061e2c4322d168a5d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/wb?keyword=toro%20lawn%20mower%2020332%20parts PDF link annotation
    • http://itactical.xyz/38677952384m9smv.pdfIn PDF document text
    • https://cdn.sqhk.co/budafitanu/gcVK4ij/game_voice_chat_software.pdfIn PDF document text
    • http://naturebiolog.space/how_long_are_layovers_for_flight_attendantsczm2b.pdfIn PDF document text
    • http://copyrightnotices-form.com/rg59_coaxial_cable_data_sheetrhi2m.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/poi_jar_maven.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/is_kindergarten_required_in_georgia.pdfIn PDF document text
    • https://cdn.sqhk.co/pawapoma/ild3Mhg/evil_cogs_gameplay.pdfIn PDF document text
    • http://1eyvgo.xyz/sibowazesibodr323e.pdfIn PDF document text
    • https://cdn.sqhk.co/wajuletixex/jjjeejj/86705619434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kutubuge.rf.gd/will_calorie_deficit_help_lose_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/sat_math_practice_test_2_answers.pdfIn PDF document text
    • http://muketatemeloj.epizy.com/what_is_energy_change_in_chemistry.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_off0000fdc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC0 5444 bytes
SHA-256: 9f5191ab536163e1415cb311b4af70fc886d3f0ce5f9ee4fe437f6873e933e46
font_01_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 11052 bytes
SHA-256: 14991a9dd2406b868fafc9dd38aa476d5fdba3f280465519d8afd3267e32e719

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