Malicious PDF — malware analysis report

Static analysis result for SHA-256 15815701589e1ea4…

MALICIOUS

PDF

80.5 KB Created: 2021-03-18 13:24:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e18a1efe7b3a0a8bf0a6bee115012569 SHA-1: b50cb5964e2539ecfa62dc4d0c2b4d3a742c497c SHA-256: 15815701589e1ea4b1625c15526d1e6696939575547145dc30182993e24b4cd9
186 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the overall structure point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://seumenha.ru/strik?utm_term=merry+go+round+langston+hughes PDF link annotation
    • http://zusiwibewire.mypressonline.com/is_there_a_money_cheat_for_gta_vice_city.pdfIn PDF document text
    • http://mikazuxo.mypressonline.com/makalah_organel_sel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_604de26d66db1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402724/normal_5ff58ef1304fb.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/48c0495.pdfIn PDF document text
    • https://cdn.sqhk.co/riwifesineji/gjhjeb7/clue_game_rules_for_2_players.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/S6Fhfjc/bisapegativafuzapijog.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/qiajhN5/alien_shooter_2_the_legend_download_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/nafusomo/Tqbrbgi/86378234085.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/PKWsqge/paint_frog_eyes.pdfIn PDF document text
    • https://demomejisalazi.weebly.com/uploads/1/3/4/8/134869482/8432959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_5fdb89c6cf006.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/jiVhhar/go_traktora_trading_inc.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/gjjhghg/chesterfield_county_courts_case_information.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467910/normal_5fc7292b35986.pdfIn PDF document text
    • https://wajupinafuju.weebly.com/uploads/1/3/4/7/134752356/1763901.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/HidGxhg/52298818381.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bilisedutave.myartsonline.com/etiology_of_stroke.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/role_du_liquide_amniotique.pdfIn PDF document text
    • http://xikusaduxofi.atwebpages.com/asalem_jarigindante.pdfIn PDF document text
    • http://baletax.onlinewebshop.net/96973414578.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/25932949125.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 5196 bytes
SHA-256: 336ff27996bc424d5b62bf8fd787833d1dd1c3e8dc73045da1e3f1bfe806fb75
font_01_sfnt_off00010cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD2 11232 bytes
SHA-256: b66b6d2a4fa67d9f121d61b3511fe5d13f15edebe3a624fdba377e011fd12cba