Malicious PDF — malware analysis report

Static analysis result for SHA-256 db129b553fcbbf03…

MALICIOUS

PDF

64.2 KB Created: 2021-01-23 16:30:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 9e782ea9ec01a1e6459ef98a35a38934 SHA-1: 6dc2e3cc0e92b1821b86f5fc1f755cbc433cc256 SHA-256: db129b553fcbbf03c562cd0ae6d3eff0854cadb78d55681711d72412409eded0
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous external URIs, including one pointing to 'jacksth.ru', which is likely part of a phishing or scam campaign. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to malicious content.

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 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/aws?utm_term=bakra+eid+hd+photos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4392218/normal_600733f3e7831.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404520/normal_5feb4a6a312e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_6007a694a523f.pdfIn PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/nujebazetosemumin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_600bf4aa02d09.pdfIn PDF document text
    • https://bamiwesuwo.weebly.com/uploads/1/3/5/3/135390748/pipalimi_bupiwafazo_poxeriju.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/femaruwamudabe-vigemiwufawidi-zajowe.pdfIn PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/110455fd369.pdfIn PDF document text
    • https://rofasaxoropop.weebly.com/uploads/1/3/5/3/135316675/punub.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/muxuki-xefami-gorimakubed-jomimepaf.pdfIn PDF document text
    • https://mazazogadof.weebly.com/uploads/1/3/4/3/134374066/tifugobe_nuvusasutubu.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/tixuvexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sezusol.epizy.com/kamudojunufav.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/arithmetic_sequence_word_problems_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/30933666080.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/naruto_shippuden_senki_versi_1._20_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/rent_guarantor_form_template.pdfIn PDF document text
    • http://rexerikilo.epizy.com/lasix_davis_drug_guide.pdfIn PDF document text
    • http://puzegekizizovin.epizy.com/60474380968.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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 5128 bytes
SHA-256: 99bceb85d5251d1e8590a2e30004f718e7172ac8af15966dfbfa09c6b1e88d6a
font_01_sfnt_off0000d214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD214 9888 bytes
SHA-256: 6275a2efcfbf15b471cb312bfd352f5d2049e839e6b79c48dd10ffbb37715f10

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