Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb6f55f63a2cb50…

MALICIOUS

PDF

80.4 KB Created: 2021-02-22 20:22:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 582c69b716af4342e550b0c7cc40ca1f SHA-1: 2914f31129333cb3dd0ce2c2572626e024d42646 SHA-256: 6bb6f55f63a2cb503491eeb5647eace5139ef3d157fe2f1e04a91ed420593418
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host SEO-optimized PDF files. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs suggest a campaign to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+make+a+wireless+surround+sound+system PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5ffb93782a448.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447087/normal_5ff69c69811f7.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/867505797814ojxu.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/zizomemafovida.pdfIn PDF document text
    • http://infokurs.design/jomevaxupuwatupomave9owjx.pdfIn PDF document text
    • http://hookup157.fun/bloomberg_market_concepts_knowledge_check_answersu79xq.pdfIn PDF document text
    • http://yogist.fun/english_to_sinhala_translation_dictionary2bvli.pdfIn PDF document text
    • http://carbags.site/statement_of_contribution_to_diversity_equity_and_inclusion_examplek0s9s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376612/normal_5fc7717df29f2.pdfIn PDF document text
    • http://arevakar-travel.com/82956215395hlnf0.pdfIn PDF document text
    • http://azorocheat1.xyz/allergene_listemryhv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fcf9bff283e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najaxobefirag.epizy.com/13132579405.pdfIn PDF document text
    • http://maferodo.epizy.com/zabazunusew.pdfIn PDF document text
    • http://vovajixavago.epizy.com/email_asking_for_information.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_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 5188 bytes
SHA-256: 16386f1a3332fcd3ee1861ded31c31f9509c7c6a29c89c2bf4300e9ff3bae45f
font_01_sfnt_off00011179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11179 10244 bytes
SHA-256: 465e0f3e2130ea3e4cb913310bc7b728e610138ad291e3d28ba6d0a2cd8c19bb

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