Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16561864f773485…

MALICIOUS

PDF

82.2 KB Created: 2021-03-25 12:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 9623ea007118af83461562a827264cea SHA-1: b01917d18e95269fd3abab5e3bbcd682b4d3fe3a SHA-256: e16561864f7734857a9a1f6e71d849df68a9db08779ef061e90d937c03b27068
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm or SEO spam campaign. The document body, though partially corrupted, contains product-related keywords and authoring metadata, which are likely used as lures to direct users to malicious or spam websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=avanti+mini+fridge+without+freezer PDF link annotation
    • http://madewithsunshine.com/rekezigapigujiafrqd.pdfIn PDF document text
    • http://fexerekuvise.iblogger.org/4047474508.pdfIn PDF document text
    • http://uose.xyz/opencv_with_python_by_examplebt6qn.pdfIn PDF document text
    • http://gevifavilovaz.22web.org/25976483992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408865/normal_5fcf9c10f3361.pdfIn PDF document text
    • http://wacc-cat.org/exam_ref_70-483_programming_in_c_portuguesethm61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_605b960c64e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463034/normal_5ffd3bbe0a107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_e58c1a218a2d42d989317a22190ca79f.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_120a36245a9a4c3b8cc4d51fbccd2c82.pdf?index=trueIn PDF document text
    • http://roninifuwevol.rf.gd/integrated_risk_management_framework.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/appropriate_preposition_bangla.pdfIn PDF document text
    • https://9c3086b9-336b-4a4d-b39c-975a2563a2e0.filesusr.com/ugd/f4f792_d462928a901845138cc69af72cc58b04.pdf?index=trueIn PDF document text
    • https://87098103-4d08-48bb-90a6-807b0ef734b2.filesusr.com/ugd/1f49de_b179cfaa5e2644b18a06fbe129526f4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wixatax/kolozusugudimamuke.pdfIn PDF document text
    • https://b2f02272-107b-4032-aafc-54cdd6265a16.filesusr.com/ugd/6cf392_f3ba3bb0600745998aa7689e4392b9c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/firudegix/pneumonia_antibiotic_guidelines.pdfIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_7cb1ba842d574d06bb2be21faad37cc4.pdf?index=trueIn PDF document text
    • https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_499d5db755be4692976c4a51603e278e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejobu/42576139518.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/xanejafevolo.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_9d03a67efd76441c94792f01e3ebc62f.pdf?index=trueIn PDF document text
    • https://6f465708-eb37-4ee2-8658-ebeec6cd93ea.filesusr.com/ugd/4bb103_8d0b95a0a4d94e60998160443a2447d6.pdf?index=trueIn PDF document text
    • http://sidakofonol.epizy.com/82957212726.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_off00010461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10461 5304 bytes
SHA-256: 2d485f8db4c5146075baa80a5287f496698c751daed494f916c4df57e1e9290e
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10696 bytes
SHA-256: 5befcbb55afd1cd8a5a7aa4efdb18c12624c9e2315cbb907ea3fac505abec929