Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9b0027a0df6fd0…

MALICIOUS

PDF

86.4 KB Created: 2021-01-12 14:36:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0e6ee8efaed1c94518d2dc975c9e0ee5 SHA-1: ee31c769d8600fed53e703b11500212657ec6b03 SHA-256: bc9b0027a0df6fd0b5038774be43ab5b226d086674f90d7b165e27e974de143c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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 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://trafficel.ru/aws?utm_term=backgrounds+for+powerpoint PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380871/normal_5f8e73691a942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470980/normal_5faae442be526.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/5358149ce20e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487665/normal_5fcb36cc4d043.pdfIn PDF document text
    • https://zukusabaxiwig.weebly.com/uploads/1/3/4/0/134000387/14bd2fe13e478.pdfIn PDF document text
    • https://bejulukif.weebly.com/uploads/1/3/4/7/134746679/d3a7670ca3dd1c9.pdfIn PDF document text
    • https://site-1177303.mozfiles.com/files/1177303/reapers_revenge_hours.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/vogubivajavofu/62816997858.pdfIn PDF document text
    • https://s3.amazonaws.com/fatisake/play_joker_online.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/jirirovoba.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/98_grand_cherokee_transmission.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/bilingual_education_books.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_off0001158d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1158D 5496 bytes
SHA-256: 513acac2de5c2b3cf1d3594b27d0d05fc5baa9600c49c5bb061fde1ae3007438
font_01_sfnt_off00012868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12868 10844 bytes
SHA-256: 91ca58d9e31fd36b947dc2294aad9f2ca4730e59c56a87e7d5e3674be3d39abc

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