Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a45879cd9538afd…

MALICIOUS

PDF

75.8 KB Created: 2021-05-01 00:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 46bddeb67caad02ba41bd8a9ad3c96be SHA-1: 0c9b8dd558df65b1395039bcf5253d5f9cd550bd SHA-256: 0a45879cd9538afd8a5cd5c69d1e6c442ab4d4f003626df26f4fc6e64b0a2384
156 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, suggesting it's part of a link farm or SEO manipulation scheme. One of the extracted URLs, 'https://zajinet.ru/strik?utm_term=karcher+pressure+washer+problems+no+pressure', is directly embedded in the document's text, likely serving as a lure to a malicious or deceptive website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=karcher+pressure+washer+problems+no+pressure PDF link annotation
    • https://mopuxemunokele.weebly.com/uploads/1/3/5/3/135318458/sivozufafop-jidezo-domozofaxerawuk-vuvel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490370/normal_6039bc7804804.pdfIn PDF document text
    • http://tusipekenodoka.22web.org/mastering_chart_analysis_skills.pdfIn PDF document text
    • http://vadinesejel.22web.org/68847117655.pdfIn PDF document text
    • https://kufepodesaf.weebly.com/uploads/1/3/4/3/134336702/9344432.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475741/normal_6032a2a0d18a4.pdfIn PDF document text
    • http://bapefajavijofo.66ghz.com/badrinath_full_movie_in_malayalam_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_606e09b81ab1a.pdfIn PDF document text
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/sowix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitatotol/cuentos_de_eva_luna_dos_palabras_resumen.pdfIn PDF document text
    • https://79e5ec13-148a-49e7-9308-7b7844992bd9.filesusr.com/ugd/1d149b_29812dd0a3be46808b661fd17a1335cd.pdf?index=trueIn PDF document text
    • https://e8c82854-2a0b-4c0f-82de-bac600ce06e6.filesusr.com/ugd/d017d5_8bb63563f4dc4af386cc38b8adab6ff4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitatotol/69073989530.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/industrial_revolution_and_imperialism_study_guide_answers.pdfIn PDF document text
    • http://gorevifero.epizy.com/compound_bow_package_bear_cruzer_g2_lh.pdfIn PDF document text
    • http://rubujizuz.epizy.com/9245378971.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/princeton_university_visitor_parking_map.pdfIn PDF document text
    • https://5f90d536-2a72-4461-adff-280afd3056cb.filesusr.com/ugd/27c394_c5f51be2fd474975a2549175b030f786.pdf?index=trueIn 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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 5376 bytes
SHA-256: dbe31a8507554dc58cecb986572df7e5ea74ddca3c25c379ec6d42656c04e46c
font_01_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 10960 bytes
SHA-256: 5ab2bccba87e6321c7cf66df7231d6fb2819e70b0fecf5b3d2ef7cf8585b8a7e

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