Malicious PDF — malware analysis report

Static analysis result for SHA-256 056e356987e4d46f…

MALICIOUS

PDF

77.5 KB Created: 2021-03-24 20:18:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7cb5ef556e596edf7aea8d7047c04fbb SHA-1: b11918dbbf3c12a28a5103f8d216b1ceeeb1e53b SHA-256: 056e356987e4d46f9e4f9ae62fc9902b5c23561b4bc5b52c93d5e294cedd1141
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xezojetit.ru/123?utm_term=bootstrap+12+column+grid+psd+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453329/normal_5ffb22668c9f3.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/1901208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413111/normal_603012c524e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386851/normal_60506b17de24c.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/zesojibepegejatet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455387/normal_602f3110423b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_601d3101cc534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375517/normal_6032346d5c8ce.pdfIn PDF document text
    • https://labajamipudoxa.weebly.com/uploads/1/3/5/3/135399896/8abb27c0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443802/normal_6018074060fd2.pdfIn PDF document text
    • http://usesucre.pro/resifojokudirunuwujuxidd21lz.pdfIn PDF document text
    • http://novonet.online/what_is_the_difference_between_term_life_and_life_insurancekxji9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383147/normal_6059b99ab6bba.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/w0ggmhg/best_gym_training_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/riwutosax/ceJdjjh/best_business_games_ios_free.pdfIn PDF document text
    • https://badakawage.weebly.com/uploads/1/3/0/9/130969543/kojowetuxaw-rulodagidinif-vidofi-texitatifupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484612/normal_604f595e11fd4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_60081d72d4766.pdfIn PDF document text
    • http://women-ita.space/the_crown_season_1_episode_4_accuracyfkjkw.pdfIn PDF document text
    • https://dibirumozogu.weebly.com/uploads/1/3/4/6/134611192/c6ca460.pdfIn PDF document text
    • http://fresh-ita.space/xuserapasoxajumuwopirs9w21.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/20982bfd-9d34-4f6c-89cf-f749ff06f53a/60334076528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef94e4a0-6bc1-43b3-8e1c-b20ba3eae0ae/how_to_run_diagnostics_and_read_error_codes_on_a_maytag_washer.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_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 5588 bytes
SHA-256: e305162fdebd63d440dba6903bb08781698791345a7e496f2c966a55e2bb06c7
font_01_sfnt_off0000f56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56A 10648 bytes
SHA-256: 28cb422b8f5a42f6d20f840a0f74d72650c168cbb2f4e06c52be4c1163ba4f56
font_02_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3