Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bba3be0f9afd926…

MALICIOUS

PDF

76.2 KB Created: 2021-03-09 20:14:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6cece0f88c394f11dcfc7cbc952d6813 SHA-1: 259b7ae78a67cd5fc3741e63c3c5ade5ffaddb4e SHA-256: 8bba3be0f9afd926c97f9c0443c6febe3ef9d73bbcb9da5043c0e01538bbf171
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms and phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The embedded URLs likely lead to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/award?keyword=turkey+scholarship+interview+questions+pdf
    • http://baugroup.info/398179583063577k.pdf
    • https://cdn.sqhk.co/ludibipimilu/hco5Phg/chinese_checkers_2_player_rules.pdf
    • https://cdn.sqhk.co/wifopuzuxiba/gKjbxhe/7_digital_music_store_que_es.pdf
    • https://cdn.sqhk.co/xubulozirod/fKXhcCy/xuxud.pdf
    • http://creditscoreusa.info/us_history_quiz_20z2z60.pdf
    • https://cdn.sqhk.co/duxadikoti/t9Vjgja/fifajemefi.pdf
    • https://tivuzukabatabab.weebly.com/uploads/1/3/1/4/131405927/lokuwel.pdf
    • https://cdn.sqhk.co/revikokelobu/hbWhaeQ/mastercraft_surf_boat_models.pdf
    • https://cdn.sqhk.co/rifarako/Digiajc/blue_bloods_episodes_free.pdf
    • https://cdn-cms.f-static.net/uploads/4418399/normal_603e3922ccb57.pdf
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5fe135ef9c974.pdf
    • https://potigaguw.weebly.com/uploads/1/3/0/9/130969810/8033085.pdf
    • http://santaparker.store/43531957184jrfsy.pdf
    • http://loveworld.club/what_is_the_top_speed_of_a_kawasaki_mule_40100gzpg.pdf
    • https://cdn.sqhk.co/nodujugebi/ijf8Xgf/the_last_of_us_2_wallpaper_iphone_x.pdf
    • http://agentsoft.space/xizepaguza020d8.pdf
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/xejoxarabaguvo_bejutot_tugogafow_pemini.pdf
    • https://cdn-cms.f-static.net/uploads/4418993/normal_60111ddf0be39.pdf
    • https://cdn.sqhk.co/pimupigedu/hjcFIMB/ifttt_or_zapier.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_off0000eced.bin
f96704961a4b05e73c0ad617df25c27bada6e912bfd17825ee3b1afa8f6b6fdb
pdf-font-stream PDF embedded font (sfnt) at offset 0xECED 5636 bytes
font_01_sfnt_off0001002d.bin
0290ec8d5a9549d45aa1341146736bb0ae5fc3d04284b37237badee3112326e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1002D 10388 bytes