Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c143c9a7de984c8…

MALICIOUS

PDF

80.3 KB Created: 2020-11-09 19:21:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 23c732ac4993cbe0a10116db2e809078 SHA-1: 8a5bef36061b3c01aaf3bce29c0a2134fc8d974d SHA-256: 6c143c9a7de984c8259488469a3ef7c0b69cede98f3ca4149d6da8e3a7882b18
244 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs suggest a phishing or spam campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/aws?keyword=structure+of+the+constitution+articles In PDF document text
    • https://zagukosi.weebly.com/uploads/1/3/4/3/134314994/xezelebaponetumoje.pdfIn PDF document text
    • https://kujituxozi.weebly.com/uploads/1/3/4/6/134625238/f95049746a4.pdfIn PDF document text
    • https://kowonuzadanovit.weebly.com/uploads/1/3/4/6/134686130/8469669.pdfIn PDF document text
    • https://wumunelopilum.weebly.com/uploads/1/3/4/3/134395902/8647091.pdfIn PDF document text
    • https://rovufeku.weebly.com/uploads/1/3/4/6/134636625/tonesup_wememe.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/wununude.pdfIn PDF document text
    • https://rofibefis.weebly.com/uploads/1/3/4/1/134131293/69bad5.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/6432805.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/5058540.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/wepeliniru/juxegoruwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7150e1d3-c541-48d4-ba67-04b8ef16ea50/xubavarivemedewemuruweve.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/pukanaxevikepo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/541fa16b-7a8e-4c19-be19-d8cbc8998cdc/jozudozikelovane.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/death_of_a_salesman_greek_tragedy.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_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 5072 bytes
SHA-256: d95fe313c8ccbd0fe5a7fa87fbc4d7534c691d6b7af1bbd89fef79a002984cb2
font_01_sfnt_off0001118e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118E 10216 bytes
SHA-256: 94ccbdc392e85eacc76eab511c09e5cba09ec67fe7f4923d3cfe044bc13c8632

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