Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c73dce0ab5cf4b…

MALICIOUS

PDF

80.0 KB Created: 2021-04-02 00:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1f43c468901149ddfc9d022d120c41a SHA-1: 166840c7bc8fa80098287366c0ab84e21f515a54 SHA-256: 34c73dce0ab5cf4b6dc07726cc8f14375b11590aea3b4aa81468ea213074da9c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO poisoning or redirecting users to malicious sites. The heuristic PDF_SEO_LINK_FARM specifically indicates a large number of external links, with one prominent example being http://tagitefidunun.epizy.com/13314020029.pdf. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=south+topsail+elementary+school+supply+list
    • https://cdn.sqhk.co/jimumakevaji/ig1heha/pubg_id_name_font_generator.pdf
    • http://gakagebir.mypressonline.com/63925351341.pdf
    • https://cdn.sqhk.co/mabisurud/dXUhcjg/instagram_free_followers_and_likes_app_download.pdf
    • https://cdn.sqhk.co/zekafomaze/Tjfijjh/mobaj.pdf
    • https://cdn.sqhk.co/kusasuzona/hhiLu4H/65987914483.pdf
    • https://muluxebaxomoj.weebly.com/uploads/1/3/5/4/135401331/sususedijomek.pdf
    • https://cdn.sqhk.co/givesaxi/jcFCZgj/file_manager_apk_download_2020.pdf
    • https://munibejexa.weebly.com/uploads/1/3/1/4/131414516/burotewixereg.pdf
    • https://cdn.sqhk.co/kafekogi/gjNrKmk/zevep.pdf
    • https://rewemaxokaw.weebly.com/uploads/1/3/4/7/134748572/gikor-kamuzojoxasepez-vidinudixijus.pdf
    • https://cdn.sqhk.co/boguzivipel/hhKhdjj/zombie_combat_simulator_apk_download.pdf
    • https://cdn.sqhk.co/tusadopovet/jb6Ahjc/kuroko_basketball_wallpaper_download.pdf
    • https://cdn.sqhk.co/tajudozizif/Yicjdjg/angry_birds_transformers_unlimited_gems_and_coins_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://tagitefidunun.epizy.com/13314020029.pdf
    • http://xakagigoneliv.myartsonline.com/26465396119.pdf
    • http://pudosuvosav.atwebpages.com/yaseen_malayalam_translation.pdf
    • http://vegenolipova.epizy.com/bppv_exercises_murtagh.pdf
    • http://lawakeweba.epizy.com/bahubali_1_tamil_mp4_songs_free.pdf
    • http://tijiwef.epizy.com/jogipemaxa.pdf
    • http://jajunoz.rf.gd/87081890168.pdf
    • http://biwosagamivi.myartsonline.com/what_is_a_plaque_score.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec51.bin
5d863f263c9a59df050ade9331e75c6ffaf6d1b38dfc300b4fc8d1a8df7cc011		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 5260 bytes
font_01_sfnt_off0000fe0e.bin
00bc015b43a1d0ec1106c1b9e861db79f9be5571f47615527bfc27d1f75945cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0E 11196 bytes
font_02_sfnt_off00012419.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12419 4324 bytes

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