Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a0ac05630e9071…

MALICIOUS

PDF

85.5 KB Created: 2021-02-24 23:22:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 54d25911593919c8284a071d143b2c8d SHA-1: 722dbe0f7c8422b6dbad0d74e4d18ce804a4153a SHA-256: 70a0ac05630e9071eddbad085b8afc13fcf69f30ab1bb816a0a1fb29d6214687
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://druttle.ru/strik?utm_term=what+book+is+after+the+dark+prophecy', likely serve as lures or part of a link farm.

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://druttle.ru/strik?utm_term=what+book+is+after+the+dark+prophecy PDF link annotation
    • https://cdn.sqhk.co/gusiloxi/rihrhbR/jumudoxim.pdfIn PDF document text
    • https://luxutavu.weebly.com/uploads/1/3/5/9/135964445/nipigo.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/texivov.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/74e30a92b5d.pdfIn PDF document text
    • http://idealica-ituficiale.website/custom_sound_button_appgrm1j.pdfIn PDF document text
    • https://ledosixekesi.weebly.com/uploads/1/3/4/3/134313849/fugej.pdfIn PDF document text
    • https://vezijukifi.weebly.com/uploads/1/3/3/9/133997169/830802c2f8acff.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvonusebex/BfiatGJ/67285912156.pdfIn PDF document text
    • https://wuremude.weebly.com/uploads/1/3/2/8/132815206/4b65e247.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/gxgihg3/10188319244.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/kubafezin/mugasusiregedi.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/61396205583.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/71709383112.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/gixonuruxoxixabopudosoj.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/bimanual_compression_of_uterus.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/luripa.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/bors_hgskola_bibliotek_och_informationsvetenskap.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/eng_vs_nz_t20_pitch_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C0 3396 bytes
SHA-256: a79d71b8599c023a80ee39100fbf4e2e1f7b6555d56bd7a18aa469e02142d8cb
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 5528 bytes
SHA-256: 4bd40fc3aa9c93b7ca9d5527a22ba3299798ae5f826791d29b5826421024d295
font_02_sfnt_off000122bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122BD 11164 bytes
SHA-256: e3bbf941fc117ca8261673bf650d79b33a3809e1283c7bde532195b3965d1c93

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