Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab82e2777ca26e4f…

MALICIOUS

PDF

80.1 KB Created: 2021-02-27 03:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4264023b2569ebd83a115ab0b9757804 SHA-1: 4ec295cbe7cd89c7658ec9e97e0f400a05fc87fe SHA-256: ab82e2777ca26e4f20c128db2885e9beb4b37932cd00738569d5830923eb8ad5
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful sites. The presence of external URIs and the 'link farm' heuristic 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://pelibifir.ru/123?utm_term=2007+chevrolet+silverado+2500+ltz+for+sale PDF link annotation
    • http://gagivukamuw.getenjoyment.net/how_to_use_proctor_silex_10_cup_coffee_maker.pdfIn PDF document text
    • http://mikovil.mywebcommunity.org/blood_shadows_slime.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvupalib/idjdghx/descargar_three_kingdoms_conqueror_hackeado.pdfIn PDF document text
    • http://siwosupegejolop.medianewsonline.com/physics_class_12_punjab_textbook_board.pdfIn PDF document text
    • http://front-glass.space/phn_mm_ct_file_min_ph_online9tydk.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/how_to_yoga_breathing_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/m1iczqK/mobile_security_antivirus_apk_pro.pdfIn PDF document text
    • http://pedrons.space/pewijitizsw2h1.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/fjbcYjb/dinghy_meaning_scottish.pdfIn PDF document text
    • https://cdn.sqhk.co/vilonunufuk/dgiahaH/piano_tiles_4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/donake/latafusojudipusoridaf.pdfIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/fapatoliziwubux.pdfIn PDF document text
    • http://zazuxevepiz.rf.gd/how_to_write_a_table_of_contents_in_apa_format.pdfIn PDF document text
    • http://tasagut.rf.gd/13851305547.pdfIn PDF document text
    • http://gefotuja.rf.gd/agt_champions_finals_performances.pdfIn PDF document text
    • http://sefobetibaboxi.epizy.com/tudolejedeno.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE966 5284 bytes
SHA-256: 03d0cc0900399dfbc3c35e9d42734f9e2bd4ae17bf80605a0cabcd557f7abdc3
font_01_sfnt_off0000fb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB80 13332 bytes
SHA-256: 73746a60a44ec383e1f02771011a2676f5dbd011d6569138cc8676999f1fb3fc
font_02_sfnt_off000124dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DD 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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