Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2c4bc37e33bc56…

MALICIOUS

PDF

71.0 KB Created: 2020-12-26 12:59:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a967bf15f197c2e411b532d5140b6a69 SHA-1: f03dc91408a83cb5ee0d3552b2324ec1d4ff81ff SHA-256: 3b2c4bc37e33bc56368a5dc0da95a17713e1f74c56b57a77563a64e0732ed7ad
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. The presence of a large number of external links, including one to 'trafftec.ru', suggests a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/123?utm_term=rockspace+wifi+extender+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387428/normal_5fb58d5e5e881.pdfIn PDF document text
    • https://cdn.sqhk.co/godivago/cqgfieI/fun_reading_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/jafetegupam/dhe9Vhf/cheapest_travel_from_athens_to_santorini.pdfIn PDF document text
    • https://jimivisimobud.weebly.com/uploads/1/3/4/9/134901817/c41c431387.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/fosalizuzu/tefemixofagifizamafipok.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/amhrn_na_bhfiann_bagpipe_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/49963620288.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/genital_herpes_bashh_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0498f799-8e3d-4c47-8460-c37392f8b4cc/the_bold_italic_purple_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1194f4ad-1ed4-4e2e-9c15-9f18f037da7f/fazuwefimexemumokujuxog.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/71839310058.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_off0000d864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD864 5520 bytes
SHA-256: 91aa4d18a54287cf86003c3527baa7b8802ce9de15094dcec58375ae7d1f4745
font_01_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 10672 bytes
SHA-256: f0df5d6701f24a886db1951a19be863c3d48816999e3e4a369f0dd18a955277a

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