Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68774a159f28e96…

MALICIOUS

PDF

79.3 KB Created: 2021-04-15 18:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c841b0d305b5fd4e28234fb1ffe136ac SHA-1: 73daeb03ea04ebbab23b1451ed11b48c72f33ac4 SHA-256: f68774a159f28e96bc8cb91cced2b68d7db196d4f2d113569c12ac3ab47db44a
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 high likelihood of malicious intent. It contains a large number of external links pointing to various domains, many of which appear to be disposable hosting services. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this is part of a link farm operation, likely designed to generate traffic or redirect users to malicious content. No scripts were extracted, but the presence of numerous external URLs and the link farm heuristic point towards a phishing or traffic-generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://zajinet.ru/strik?utm_term=2008+suzuki+drz400sm+service+manual+pdf PDF link annotation
    • http://lixodamevurobar.mygamesonline.org/6561639243.pdfIn PDF document text
    • https://cdn.sqhk.co/zanuvajebodu/j4yD6T8/guardian_tales_wiki_world_2.pdfIn PDF document text
    • https://semitedajun.weebly.com/uploads/1/3/1/6/131636975/fufediferogiv_ruraseboj.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/hxhiqgc/puvubogijopufonoduta.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/6jXjjgg/walking_dead_world_beyond_episode_1_ending_explained.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421352/normal_5fe1d349033d7.pdfIn PDF document text
    • https://cdn.sqhk.co/lasanamemego/jy3jjhc/rabibugusugigubasunaniwag.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/dqhhdih/apple_pages_wedding_invitation_template.pdfIn PDF document text
    • https://pabixiwirixe.weebly.com/uploads/1/3/1/0/131071256/mejuw.pdfIn PDF document text
    • https://vipamabukaxeban.weebly.com/uploads/1/3/0/8/130874648/wusora.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/dhjgMG8/lifezegevodorabiwomov.pdfIn PDF document text
    • http://mozobadijoba.medianewsonline.com/aseptic_processing_operation.pdfIn PDF document text
    • http://pasipodo.mypressonline.com/literary_devices_list_and_definitions_and_examples.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/72523451209.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370268/normal_5fdbc21b699ad.pdfIn PDF document text
    • https://zitifulopesere.weebly.com/uploads/1/3/4/7/134722705/lamobowitowuvosu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383460/normal_602b6efb3942f.pdfIn PDF document text
    • https://cdn.sqhk.co/jinuminex/iiQggQ2/nibevezazamiw.pdfIn PDF document text
    • https://cdn.sqhk.co/dopiporajen/jjRUQ29/css_div_rounded_corners_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/gf7wicQ/linujeba.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
    • http://jifimurosesapu.atwebpages.com/asiaticos_podre_de_ricos.pdfIn PDF document text
    • http://tobikinos.onlinewebshop.net/functional_resume_sample_for_fresh_graduate.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 5628 bytes
SHA-256: dfa7a921efe13024f89cf1d869afc0293393fd170f0dd36c6658fa367c4c3b08
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 11472 bytes
SHA-256: 5bb57aa7282b17d25fcbcf1ce995e9dfef3d9f934fe005a5f19d99b54270b667
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3