Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d621f70c5fda93…

MALICIOUS

PDF

81.2 KB Created: 2021-02-09 09:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012c113037cd62b707aa865af5f90b72 SHA-1: a04171fe17d7b265084c2161835eeb0d9dbcdcaa SHA-256: a2d621f70c5fda935144661277ac3bb5e2694008b60d59838c52b28965ace334
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, forming a link farm, and one of the embedded URIs points to a domain associated with SEO spam. The document body, though partially corrupted, suggests a lure related to game hacking, likely intended to direct users to malicious websites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wb?keyword=h%C6%B0%E1%BB%9Bng%20d%E1%BA%ABn%20hack%20game%20archero%20android
    • https://botakukejase.weebly.com/uploads/1/3/4/6/134610266/lutodixaxadasan.pdf
    • https://cdn.sqhk.co/vefusujix/igibKja/marble_blast_cool_math_games.pdf
    • https://cdn.sqhk.co/jasurisunav/aqshaid/dogfighter_ww2_ps4_single_player.pdf
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/folomukugujub_fowozel.pdf
    • https://cdn.sqhk.co/nufomewo/gfRgdMs/69717892716.pdf
    • https://zevofukuje.weebly.com/uploads/1/3/4/5/134585027/596187.pdf
    • https://sejiganabukuja.weebly.com/uploads/1/3/4/5/134585043/cf7973823ff.pdf
    • https://cdn.sqhk.co/dofubetu/iftPczC/swords_and_sandals_2_redux_maximus_edition_cheats.pdf
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/a1f3ee.pdf
    • https://cdn.sqhk.co/ripalufix/1gfjbij/castle_siege_mineplex.pdf
    • https://cdn.sqhk.co/jakabapewuv/hbrtjhg/promised_land_movie_songs.pdf
    • https://patoduwewoz.weebly.com/uploads/1/3/1/4/131483118/77e357aff4d73.pdf
    • https://cdn.sqhk.co/vagofedewat/zijidhi/english_home_pony_2019_schedule.pdf
    • https://dosabaret.weebly.com/uploads/1/3/4/8/134861273/juputalanepe.pdf
    • https://cdn.sqhk.co/vimewiki/dib8hdc/55184882846.pdf
    • https://cdn.sqhk.co/wuvupalib/dhde5RP/strawberry_poke_cake_recipe_with_frozen_strawberries.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eedb.bin
3c75f2e405b0ea6f660a51028c880cc66a8e85a16e32c4fd8ca321487bfc641b
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDB 5824 bytes
font_01_sfnt_off000101bb.bin
4de2110c787ae92a0731472cffe9e0add3c346cf26e3800a804601f705bb9f0e
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 23696 bytes