Malicious PDF — malware analysis report

Static analysis result for SHA-256 282820c602a820aa…

MALICIOUS

PDF

73.8 KB Created: 2021-03-04 20:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1ed376436cbd265acf897bba7a0b2142 SHA-1: c8f31f82c106388cee1b361e2ddffc7446d6b725 SHA-256: 282820c602a820aaa8f4a5324b85a0180ca5412e7313fc53120e2e92c68687dc
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'student activities manual answers' and application metadata, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://golowaki.ru/strik?utm_term=golosa+student+activities+manual+answers PDF link annotation
    • https://cdn.sqhk.co/wuvexudid/jDjeFhr/play_4_ga.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/haicEgf/american_football_national_league_apk.pdfIn PDF document text
    • https://bukodagunotul.weebly.com/uploads/1/3/4/0/134012399/jaxokotojerimil_mipufik_wilitebifefuter_ligogisan.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/kadiwotexaxij.pdfIn PDF document text
    • https://zopizegojuv.weebly.com/uploads/1/3/1/3/131380511/porenaji-wiviluvuwed-fasewajarinaxub-defat.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/phhAPhj/space_shooter_3d_juego_gratis.pdfIn PDF document text
    • https://nimidakotogala.weebly.com/uploads/1/3/0/8/130874585/3f258a48f79b.pdfIn PDF document text
    • https://gupolakeg.weebly.com/uploads/1/3/1/8/131871569/motodol.pdfIn PDF document text
    • https://cdn.sqhk.co/jaxubefe/gcibhXq/moon_blast_ball_blaster_cannon_games.pdfIn PDF document text
    • http://shopmzm.site/61703105966fb9f8.pdfIn PDF document text
    • http://kogutojoveso.mywebcommunity.org/33952658453.pdfIn PDF document text
    • http://reggis.info/multiplying_complex_numbers_in_cartesian_formpqi6e.pdfIn PDF document text
    • https://xufiridib.weebly.com/uploads/1/3/5/3/135346556/kilopawojagavi-nogevinizo-julomazigoloxod.pdfIn PDF document text
    • https://cdn.sqhk.co/wotirixa/4SiThbj/mamizumewijalij.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/51659539490.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/kig5hfM/best_gold_farm_wow_classic_mage.pdfIn PDF document text
    • https://cdn.sqhk.co/tevotapomow/QjX8jhe/meruneg.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/sizilesebataxofasezokox.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/gjdibze/silicon_valley_season_6_episode_6_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisitixinu/haPhf6Q/slice_of_life_anime_movies_2019.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
    • http://zogosugo.onlinewebshop.net/66718116872.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/75957374559.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_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 5152 bytes
SHA-256: e1e09ebfec3fbe10559382d1c1f16d3cae0d71ceb256573993fa4b6002e6c880
font_01_sfnt_off0000e513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE513 12156 bytes
SHA-256: 6795bdb08d4b66aede1e44c99f48d907f56f6e7ec8129d8cb4712b29bc0db473
font_02_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3