Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0f3c525734d7ac…

MALICIOUS

PDF

107.4 KB Created: 2021-03-20 04:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 57723e7b97d27cff318c061ef109b2e0 SHA-1: bc01b734326ee73f7776f1efdc716810f00f6830 SHA-256: ac0f3c525734d7ac976a916ee070517b8321ee0c383016f3384b03422d1fa893
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. One of the primary URLs, 'https://pelibifir.ru/123?utm_term=haart+guidelines+2019', is flagged as unknown reputation, suggesting a potential malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=haart+guidelines+2019 PDF link annotation
    • http://wiinorama.space/dedufiwumuvofuvasewfue31.pdfIn PDF document text
    • http://maslovauto.ru/jekeniqh5rh.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/favukuverejajemuxijafets0bgz.pdfIn PDF document text
    • http://sifinefopor.iblogger.org/bid_wars_game_apk.pdfIn PDF document text
    • http://mattelipsticks.site/resistance_band_workout_plan_appzdpt0.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/0d71d415-19eb-44cd-844e-5b6deda5e677/jazzy_power_wheelchair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa104cc1-4845-4d85-b5e5-5e4bb5d5db9d/39291927215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8806b69a-bbae-4ebb-bb2c-61dd629e72c7/tumuduzurobemebepomitul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a426f279-5bde-4e7d-912c-904111cc092b/kiradabutedako.pdfIn PDF document text
    • https://9e77dbea-16d6-438e-9859-4a68c5388828.filesusr.com/ugd/3225da_cf36fc3121614ff6b2673e14e9e79fd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf5f23c2-fa2e-468b-b653-5d78783e755e/zudobo.pdfIn PDF document text
    • https://b91da389-de5e-4eda-9c11-73399619626a.filesusr.com/ugd/c34eac_ed6184070cce4f7585f567cba4c9644b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e72d43-d3b5-4820-9b9b-dca275ec688c/sea_ray_owners_club_apparel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808adaec-43cf-4b5e-b27d-9216e14fc2e6/74741619649.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063d75b6-a2f4-4004-8ae7-6d37fa973782/kegagutezetov.pdfIn PDF document text
    • http://lunijikujapike.epizy.com/gigofugezeju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0061f26a-4fcc-474c-92a5-2d88487c45a5/venn_diagram_practice_problems_with_answers.pdfIn PDF document text
    • http://sepinolet.epizy.com/wojavuminudogenejivoj.pdfIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_68e37e49a2d44df7b6dddb0d224e8369.pdf?index=trueIn PDF document text
    • http://gobudulofi.rf.gd/fafakujexopinidanara.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_off000166d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D0 5436 bytes
SHA-256: 43de389530db48ae8b0c6beed20b9766743e3c75ae5cb3bd254cbc89e5dd90ad
font_01_sfnt_off00017958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17958 12180 bytes
SHA-256: 377d0f6bb242b2e47c71e810705ee7d79839f7514095a460d3beedeaae0bccbc