Malicious PDF — malware analysis report

Static analysis result for SHA-256 5352e0c326422e24…

MALICIOUS

PDF

92.3 KB Created: 2021-03-31 20:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: aecaad5e0a2a34779961f5ee18ad7672 SHA-1: 5b2842c1a6378945f7fa7daef8666d58c002bfc2 SHA-256: 5352e0c326422e248aad69022265c81082203f763081b82e838653466367122b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/wix?keyword=wep+springs+worksheet+answers PDF link annotation
    • http://nuwikivetajed.iblogger.org/accrued_salary_expense_on_balance_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379498/normal_5fddbdf33181c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486190/normal_5ffd2068b03e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454056/normal_6056ff190bc25.pdfIn PDF document text
    • https://cdn.sqhk.co/kojetozativ/hgiCqTy/juruladavakilusela.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/1hfmYIC/tefebutapo.pdfIn PDF document text
    • https://cdn.sqhk.co/xukigipeduve/gjMha1T/46437887228.pdfIn PDF document text
    • https://xomuwesakutizid.weebly.com/uploads/1/3/5/3/135393414/5c173695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_6047515fd0ce0.pdfIn PDF document text
    • https://cdn.sqhk.co/senagoxosog/iiO8Dn9/assistant_manager_job_description_restaurant.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/hdzqDsD/overlord_platinum_dragon_lord_stats.pdfIn PDF document text
    • https://ditoleruv.weebly.com/uploads/1/3/5/3/135345680/3902099.pdfIn PDF document text
    • https://cdn.sqhk.co/luzeginu/aNIghDZ/trending_hashtags_2020_covid.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/yieijgh/app_para_ganar_diamantes_gratis.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/rubetufinikovovem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe8bddb25f2b.pdfIn PDF document text
    • https://lufakonu.weebly.com/uploads/1/3/4/7/134711707/vekivupiravu.pdfIn PDF document text
    • https://motefeka.weebly.com/uploads/1/3/4/1/134108707/7819658.pdfIn PDF document text
    • http://pipopituga.22web.org/89669141055.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/081a2e0c-a389-4516-9c60-d537debe1ea1/nerimibisoxakinelajep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7ddd55b-85dd-43d5-9cfb-bff3a8f5b067/wenuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64158928-66ce-4404-bbb6-646780165d68/jutaxerazobufiwovuxavu.pdfIn PDF document text
    • http://xeleleragakiji.epizy.com/star_trek_the_next_generation_season_5_episode_2_darmok.pdfIn PDF document text
    • http://gojopowijevefon.epizy.com/life_after_death_book_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3935aced-3aa7-47f2-b6c9-8e9efa4edbe8/guxugagupixiwuserixaxap.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_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 5220 bytes
SHA-256: 6c4fb58f28f781dd1105527e33348a282aa0af6a042e4c4527736cf824a4aef7
font_01_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 11788 bytes
SHA-256: 8855e1ff578af70129f94d4f32100fbb81d501f9fcbf020b031a21cd63990cf0