Malicious PDF — malware analysis report

Static analysis result for SHA-256 3de09a15aa566c53…

MALICIOUS

PDF

77.3 KB Created: 2020-11-17 09:49:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 263ca444177c46d4d3cec42edc9c4705 SHA-1: 14757c751a13e2f8f5beb9079bdd57c48980e766 SHA-256: 3de09a15aa566c5365e3ebab25b260fb437459f0e88fecc0a07fed43baf73f58
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, with the primary one being a lure for 'Bhagavad geeta in gujarati pdf'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a tactic to distribute or obscure malicious content. The document body is heavily obfuscated and appears to be generated content rather than user-readable text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://trafffi.ru/strik?utm_term=bhagavad+geeta+in+gujarati+pdf PDF link annotation
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/3204897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369516/normal_5f882feac8e23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fa9ec2a6f60b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366969/normal_5f96cf1faf7a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453730/normal_5fafe1d6b701e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f870920c8535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_5f8ebdaa3dbf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386620/normal_5fafd140e5abe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_5fa493482353b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_5fa0cfbde8011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/04f9ee57-255e-4d58-8090-aec4e440ab3b/vubikemixezaraz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48acf43b-59a5-48f9-ac36-c989dc254542/vixekapumepokabegewutojor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9e0084d-17c0-43a9-94dd-ba6e02769c30/badoo_baixar_grtis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8109377-b2d2-4e81-bf43-db89f1bf4374/where_to_watch_degrassi_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9590a867-a069-4c6c-8498-76b968d04040/mafia_1_kurtlar_vadisi_modu_full_ind.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_off0000cebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBF 5276 bytes
SHA-256: 7c68b2acb15c77beab8af1a003fefa15e7bd85299d0db525739c1d83cacd7fc8
font_01_sfnt_off0000e0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C2 10604 bytes
SHA-256: 370d8d10812dee25f2ef00528106df705c1a1d7be49cd1d25171fcf09ff93113
font_02_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10924 bytes
SHA-256: 91709ba0617236b9bffcd009d5d01bae0168fdccf85d3fe5b5f4e2735a483fa6

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