Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9d7aab07bc05287…

MALICIOUS

PDF

77.0 KB Created: 2021-02-14 04:40:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 23cfa38bfc3c8f3650285a3c93825c37 SHA-1: 0f403577c3259632321155d2a5be9ba7cf7f8ce6 SHA-256: e9d7aab07bc05287e892b1cfcf7462badccd0eb9325df30ba03a1eb4d9ee4142
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The document body contains a suspicious phrase, 'Be kind to animals or i'll kill you with a pencil', which may be a lure or part of a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=be+kind+to+animals+or+i%2527ll+kill+you+with+a+pencil PDF link annotation
    • http://hamsterbig.com/spacex_crew_dragon_mission43d4p.pdfIn PDF document text
    • http://1cats.space/pedro_hernandes_dias_lopesp3nqu.pdfIn PDF document text
    • http://clyb-wylcan3.space/big_theta_notation_examplessgrg3.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/34833844093546d1.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/fosupanobisiji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_600be7622a5af.pdfIn PDF document text
    • https://nuxagaselupig.weebly.com/uploads/1/3/4/0/134016775/37783.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465565/normal_5ff2496272ecc.pdfIn PDF document text
    • http://ionatr.space/fivem_transport_tycoon_trucking5ctqp.pdfIn PDF document text
    • http://dle-tpl.site/destiny_2_zero_hour_guide970c2.pdfIn PDF document text
    • http://virnet77.ru/monster_truck_hill_climb_drive_offroad_gamesel5k4.pdfIn PDF document text
    • http://italy50wow.pro/69805008492xqy98.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/64400335581fsog3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467277/normal_60260870a688f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000daef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEF 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000ebd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD4 5652 bytes
SHA-256: 8f24de7b10047501a0b7fca3f39bb992ab00128d6609c0392de1a819cb60c440
font_02_sfnt_off0000ff09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF09 11828 bytes
SHA-256: 878718fc93656255937fc789abd6a159d38012f13753ec49c466f7a11df9d722

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