Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1746ae7703e1ec…

MALICIOUS

PDF

73.7 KB Created: 2021-02-16 20:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 53994681e75e04e24733e80bf767a55f SHA-1: b5bce537f13334d31a086295ca5954a250d773bd SHA-256: 8b1746ae7703e1ec759888a0ab2b402e49b851ce456edcdca4208532d75c6cca
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with critical heuristics indicating a PDF link farm. Numerous external URLs were extracted, with the primary suspicious ones being http://redirunna.xyz/mofizosizisutemegujarutkwod.pdf and https://leonvi.ru/strik?utm_term=is+it+ok+to+rent+without+a+lease+green+bay. The document body is heavily obfuscated and unreadable, but the presence of many external links suggests a phishing or SEO manipulation attempt.

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://leonvi.ru/strik?utm_term=is+it+ok+to+rent+without+a+lease+green+bay PDF link annotation
    • http://redirunna.xyz/mofizosizisutemegujarutkwod.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ghjdjes/galaxy_moto_rider_200.pdfIn PDF document text
    • https://cdn.sqhk.co/lepapina/dTjhYcf/bcit_west_genesis.pdfIn PDF document text
    • http://mazers.fun/narogajalezerukewuviwaku6ze32.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/Dhd2Eeq/thai_alphabet_flashcards.pdfIn PDF document text
    • https://cdn.sqhk.co/tumowara/ggdjbii/my_pcc_account.pdfIn PDF document text
    • https://zudejuzire.weebly.com/uploads/1/3/2/6/132681250/b13bfe462.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/bidemewufa/severaliwidasebig.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/60803221210.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/funupujatedetujalujuzup.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/40548690422.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/57679737882.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/e-_passport_application_form_kenya.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/world_earthquake_live_report.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_off0000e0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A5 5284 bytes
SHA-256: 3fc0730239c6dd2f22a03e202bc70bcf6acbd92b9236ae6936689bc4a1b5b538
font_01_sfnt_off0000f2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B3 11400 bytes
SHA-256: ec927badcdbf66db4561dd38b1f37e0734009b81d6ab55376de54eb00d356464

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