Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b59f87e238e1fbd…

MALICIOUS

PDF

83.4 KB Created: 2021-05-01 06:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 24bfae949403bd5d76219ce5a583305a SHA-1: 2e04a118e8821052744f6c72fab229e53b3072c4 SHA-256: 2b59f87e238e1fbdedbc0a24d788174b146820ad03df5ef7bac79c7acf8017a1
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains numerous embedded URLs, with a prominent one pointing to 'https://jacksth.ru/strik'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external links is the primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://jacksth.ru/strik?utm_term=how+to+reach+the+wave+arizona PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375353/normal_5feaee3d2b677.pdfIn PDF document text
    • https://kebolegenadudus.weebly.com/uploads/1/3/1/4/131454121/faveseker-masipifemeb-memabe-kipasafosixawer.pdfIn PDF document text
    • http://strapslap.online/mipewudaxadumm2icm.pdfIn PDF document text
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/wuxatij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_5fc5eb94b6b20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403283/normal_606939c5ec0b2.pdfIn PDF document text
    • https://voduzivesaduv.weebly.com/uploads/1/3/4/4/134456438/b1b82f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408460/normal_5ff8c7f4923b5.pdfIn PDF document text
    • http://bbcua.site/jenonokuguwanexepk67kt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5ff18c04b6e9c.pdfIn PDF document text
    • https://tujazewus.weebly.com/uploads/1/3/6/0/136028127/4e388927d.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/fotobi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_600bf908b316c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416301/normal_600b241f1e0cc.pdfIn PDF document text
    • https://dokarugosili.weebly.com/uploads/1/3/4/3/134362608/kepitifujepis-rumifazowoka-wedebijazi-wisulu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_5ff71a9605d22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zuronixo.rf.gd/bartonella_bacilliformis_morfologia.pdfIn PDF document text
    • http://diratat.rf.gd/how_to_add_image_to_picturebox_in_vb.net.pdfIn PDF document text
    • http://wapowidomuf.epizy.com/nom_concret_et_abstrait_exercices.pdfIn PDF document text
    • http://tewidunutazi.rf.gd/zazefasos.pdfIn PDF document text
    • http://vobapaz.epizy.com/synonyms_for_artistic_forms.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_off0000fa0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0E 4628 bytes
SHA-256: 54e8b356fb124694f706f7451b5d488437b0ce0699458847ec5a7b341dbe278a
font_01_sfnt_off000109cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CF 11424 bytes
SHA-256: e83826ca67282312c7261332faacf08415536d6a4a7d5e09c298e645619c8ccf
font_02_sfnt_off000130ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130AE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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