Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a59d5118a6c5edd…

MALICIOUS

PDF

75.8 KB Created: 2021-04-13 15:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d60c1d0e56d7c228939d371f15730fd9 SHA-1: 20b4807e3ed870ea622adbfcb1cc6237c15448f0 SHA-256: 1a59d5118a6c5eddbfa3c5c9703b04f15b79fb078f7c8a2d2a30d1e0bde29b53
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 or SEO spam operation. The document body, though heavily obfuscated, contains references to 'saber tooth tiger extinct' and 'wkhtmltopdf', likely a lure to drive traffic to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fokemale.ru/strik?utm_term=what+made+the+saber+tooth+tiger+extinct PDF link annotation
    • https://cdn.sqhk.co/samekikogeri/HbijjbC/war_of_kings_facebook_game_cheats.pdfIn PDF document text
    • https://cdn.sqhk.co/remowiwa/ieigAjh/wigapizigub.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/iRjbkSh/juwew.pdfIn PDF document text
    • https://bonosojemigapa.weebly.com/uploads/1/3/0/7/130776366/xaguxor-dogosepi.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/mevakimovadil-makijodijepasen-roxuxujapawejax-pelewipodijuzuf.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/zajesika_napatezas_tizamefuzix.pdfIn PDF document text
    • http://jetavof.sportsontheweb.net/petovugilinerupu.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/masorot.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/9AhdZCS/xidiwaxaruwitape.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/1YgeQLC/38907182894.pdfIn PDF document text
    • https://cdn.sqhk.co/toridezoxiko/Tj0CFoa/movie_sisters_of_house_black.pdfIn PDF document text
    • https://ruzudewalaxuge.weebly.com/uploads/1/3/4/4/134497745/3a63e20e6c1.pdfIn PDF document text
    • https://cdn.sqhk.co/lojosexotak/icbJhfS/wimedogisoge.pdfIn PDF document text
    • https://cdn.sqhk.co/wemonamo/ajhPZqp/vufalodagatolijumo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retiziwo.myartsonline.com/55829279470.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/maandelijkse_annuiteit_berekenen_formule.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/contract_agreement_templates_word.pdfIn PDF document text
    • http://titugol.atwebpages.com/50633161086.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_off0000ea7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7D 5544 bytes
SHA-256: ab5f9047d5e706ee1c1e94b7032692cedc5548fa0e7cd36ad8b148570910fca6
font_01_sfnt_off0000fd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD36 10396 bytes
SHA-256: 81199b52950599798ffaf7070ab87ff6457d3fd497b11f392558ec43dd91c604

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