Malicious PDF — malware analysis report

Static analysis result for SHA-256 05b1b0251b90c0c5…

MALICIOUS

PDF

78.2 KB Created: 2021-03-15 07:38:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 81b4a05ab2652c6718ea123b02bbd867 SHA-1: 598bdc7f7501e25efda05a0360515ab941ab0a0b SHA-256: 05b1b0251b90c0c57c417d50cd04f53f1ce8271166a025ac1440bd09f9daae2e
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosting services, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

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://pelibifir.ru/wix?keyword=skyrim+assassin+perks+guide PDF link annotation
    • https://cdn.sqhk.co/nodezaneripe/co0l4id/scp_site_19_map.pdfIn PDF document text
    • http://cooldomen.space/canadian_country_music_awards_2020_winners3nlzn.pdfIn PDF document text
    • http://okrasote.info/3206130876633vb2.pdfIn PDF document text
    • https://cdn.sqhk.co/fidasawon/cPjfWia/43980468803.pdfIn PDF document text
    • https://jodaxirijiv.weebly.com/uploads/1/3/0/7/130776114/c604e9.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/33732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499334/normal_602352f288c11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_6012de266038e.pdfIn PDF document text
    • http://begdas.space/digital_design_and_computer_architecture_solutions_evencczu4.pdfIn PDF document text
    • https://cdn.sqhk.co/kixarozikej/C3GigiW/nowatiwogogati.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/gjZViif/attainment_test.pdfIn PDF document text
    • https://cdn.sqhk.co/doparibi/eigjjjf/25646444477.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/cggBXha/59188922673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_601edcd0b7c9a.pdfIn PDF document text
    • https://suwelebebos.weebly.com/uploads/1/3/5/9/135959353/868055.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/gjFGkCG/vemevubujanofabajulakomub.pdfIn PDF document text
    • http://wekeb.space/zebra_zp_450_ctp_manualt6ea7.pdfIn PDF document text
    • https://wosepujejos.weebly.com/uploads/1/3/4/6/134649517/migelotumas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/1df0a752-c982-46a5-a50a-b329132bd7d1/what_is_the_best_computer_for_university_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09bba45-be64-418e-95d9-b6193cf9d307/how_to_fit_integrated_headset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0edcdc91-8d7e-4f44-b656-ac166ea5b06b/xefamebitulusezevamil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 5208 bytes
SHA-256: 35fbaa839f8254076b7ed5ea49c08c16a63b16f8d1e40479eb6bf9c0abd25c99
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10432 bytes
SHA-256: 624de71c79164ee4565a73608771e900bec111d131ef22ffa0683c5b2a51f30f
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3