Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56a4910888f10b6…

MALICIOUS

PDF

86.6 KB Created: 2021-03-14 16:12:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 11634851d1ee83b6a67909d384276297 SHA-1: 8284f1ebd00f2c3b56c87ee1955e9bb08b3c4c74 SHA-256: c56a4910888f10b659663fae3a2a01b8a330937aa2c868cfcd24a320c569fdae
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple embedded URLs, with one prominent URL pointing to 'vilenefex.ru' which is associated with a link farm heuristic. The document body, though heavily obfuscated, contains references to 'wordpress themes for wedding photographers', suggesting a lure to attract users interested in that topic. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to malicious sites.

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 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://vilenefex.ru/strik?utm_term=wordpress+themes+for+wedding+photographers PDF link annotation
    • http://dubesitobu.22web.org/livekekegunezodakikuvabem.pdfIn PDF document text
    • http://true-board1.club/java_8_language_featuresle415.pdfIn PDF document text
    • http://copyright-securityx.com/the_trial_of_the_chicago_7_release_date3zxzr.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/60016757007.pdfIn PDF document text
    • http://my-favshopf.online/82188681230eb076.pdfIn PDF document text
    • http://registrat.space/70531311250ws53g.pdfIn PDF document text
    • http://merogerofame.66ghz.com/concrete_fish_pond_construction_in_nigeria.pdfIn PDF document text
    • http://pinenud.mygamesonline.org/60172031145.pdfIn PDF document text
    • http://gulakami.22web.org/15685722173.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_6a1091cf39f64833bac13e47403e0316.pdf?index=trueIn PDF document text
    • http://zorogeloma.epizy.com/jajuvawakalisiviraduxonu.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_263877f4d8fa4c2c9640a916af8faefd.pdf?index=trueIn PDF document text
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_4a89b333515c424580d87dd2dc87695b.pdf?index=trueIn PDF document text
    • http://xirewubekato.epizy.com/89843921586.pdfIn PDF document text
    • https://76c9fb28-c10e-4950-85be-37de24a2ede8.filesusr.com/ugd/fa32a6_09a6547a0d0f45a0b52098a35c559ef2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazovugal/approaches_in_teaching_literature.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/68443323625.pdfIn PDF document text
    • http://kibululugavi.epizy.com/ammonification_and_nitrification.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_off000115de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DE 5528 bytes
SHA-256: 945e14ae59b47f1e8cc23f7be366384506c88218745056e362d349ae285d72c0
font_01_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 10100 bytes
SHA-256: ef68fb9f2f4a4fe0a2d6d15e31d40e3ef173d688d9b86b4ba7db77fcd5b908c9

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