Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2465e2191971754…

MALICIOUS

PDF

69.3 KB Created: 2021-04-20 14:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e0fea16daf609c4d8420398a8ac80b67 SHA-1: 22db05f01d4abea23abc1843ce4481577ac8af23 SHA-256: e2465e219197175475c5a3a1d5659082655768e511ee3820a02e343a3b774fab
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with one prominent URL leading to 'jottigo.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically classifying it as a phishing or trojan PDF. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'excel for beginners', suggesting a lure to disguise the malicious nature of the links.

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
  • 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://jottigo.ru/strik?utm_term=how+to+use+excel+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375704/normal_600fc833282ac.pdfIn PDF document text
    • https://bovakexigi.weebly.com/uploads/1/3/5/3/135314068/dukorujilufim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_602ed439860ae.pdfIn PDF document text
    • https://pipedexow.weebly.com/uploads/1/3/4/8/134852679/3610377.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6e00f30c-c2f4-4f8b-b3fa-04142e93d3a6.filesusr.com/ugd/7b3c9f_d0c9d672e65a4cf488329966c2159fa9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e52b61a4-26e5-4220-8463-66299ba2352b/kapuma.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/xakafadotopaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00d65255-e446-46c6-9214-43479d70b976/venn_diagram_generator_powerpoint.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b1489e3-b9f5-4572-b3df-f700186058db/what_does_it_mean_when_a_pension_plan_is_fully_funded.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642be3af-b9bd-491b-b644-765659e4e32c/16324209100.pdfIn PDF document text
    • http://wujukigow.rf.gd/pekafonuvopik.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_130ae6ca852d4f83921caf21e163d080.pdf?index=trueIn PDF document text
    • http://famuruvif.epizy.com/xogejewuxijuvapig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/176d1ab4-02c9-46af-b736-2c8fced1a6f6/model_3_long_range_awd_specs.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/bigg_boss_3_tamil_episodes.pdfIn PDF document text
    • https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_5e640e72f3c14096bbecf2790264425b.pdf?index=trueIn 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_off0000d1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A3 5372 bytes
SHA-256: 22a537fd4cc2a02d4b74bb26bee0496daf9a7f8b8d85af9baec7dd90d9f268e8
font_01_sfnt_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 10596 bytes
SHA-256: 90cb94ca3e823eb3313f92531d2a0f27522d610fd0d06a3c4610c3b33d83b172

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