Malicious PDF — malware analysis report

Static analysis result for SHA-256 b690d8e5530e5e1a…

MALICIOUS

PDF

72.9 KB Created: 2021-06-05 21:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a5f25421b9fdec0e9064fc076c54c70e SHA-1: 113991f5fc7019e80b3677e4c6e0a1c5b3c03810 SHA-256: b690d8e5530e5e1a6577f1ac8a48f2202600132d5b7a9b2b7dfba87c2f7fa0b5
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://irlanc.ru/pbw?utm_term=should+you+read+the+dark+tower+series PDF link annotation
    • https://biwakegexenulu.weebly.com/uploads/1/3/4/4/134437141/5d44bb5.pdfIn PDF document text
    • https://rugezanuw.weebly.com/uploads/1/3/1/4/131483337/5552125.pdfIn PDF document text
    • https://kexipana.weebly.com/uploads/1/3/2/7/132740250/metozadumalu.pdfIn PDF document text
    • https://mafidusat.weebly.com/uploads/1/3/4/1/134109097/62516b2e3a.pdfIn PDF document text
    • https://bonawoxe.weebly.com/uploads/1/3/3/9/133986387/sexaxazijojuta.pdfIn PDF document text
    • https://baresifesej.weebly.com/uploads/1/3/4/1/134131831/koxivis_xaxujos_raleruzuteje_dirudupuwe.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/fimoxo.pdfIn PDF document text
    • https://rewazuxaroro.weebly.com/uploads/1/3/4/3/134341361/bavarexituvijin.pdfIn PDF document text
    • https://jefupijoban.weebly.com/uploads/1/3/1/4/131437873/ed7c798584b451.pdfIn PDF document text
    • https://vuvudarekiw.weebly.com/uploads/1/3/4/0/134017261/budizivugerebe.pdfIn PDF document text
    • https://javodezupaxut.weebly.com/uploads/1/3/1/3/131380273/bawuxovor_pozaferuvemag_moruw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilawuxifi.pbworks.com/f/2104834190.pdfIn PDF document text
    • http://ronakiko.pbworks.com/w/file/fetch/144553131/how_do_i_reset_my_mitel_voicemail_password.pdfIn PDF document text
    • http://kolelulu.pbworks.com/f/rakesebez.pdfIn PDF document text
    • http://sovafiben.pbworks.com/f/mekojumili.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/f/mbd_english_guide_12.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/how_to_apply_arrear_exam_in_madras_university.pdfIn PDF document text
    • http://xugatun.pbworks.com/w/file/fetch/144610014/wow_cable_channel_guide_detroit_mi.pdfIn PDF document text
    • http://fodorafirig.pbworks.com/f/word_formation_processes_exercises_with_answers.pdfIn PDF document text
    • http://vatojorisa.pbworks.com/f/ruvurorovape.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144529914/como_pasar_de_ml_a_gramos_en_quimica.pdfIn PDF document text
    • http://xesimisejek.pbworks.com/w/file/fetch/144500697/how_to_use_philips_avent_fast_bottle_warmer.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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 5272 bytes
SHA-256: 802f70c7d262e11bc23d695aca44e95ae3d207fa79580a4f61e61e6b559488b3
font_01_sfnt_off0000f385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF385 10272 bytes
SHA-256: 671a0a57d905a646accfeb32974dd8e2872c15851a284436f890563e8895d0da

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