Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a79ea13e91a406b…

MALICIOUS

PDF

67.7 KB Created: 2020-12-10 06:00:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df0c1e26eafd86037f00c4e71ed24e27 SHA-1: 21eb9dab0eceb3b13f2367c8454b6b6d06ab5e04 SHA-256: 2a79ea13e91a406b4eb58b9739d86aee056bf2d3db034383ede6789ea62893c9
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/aws?utm_term=android+framelayout+align+bottom'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within the document structure strongly suggests an attempt to lure the user to a harmful site, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://traffmen.ru/aws?utm_term=android+framelayout+align+bottom In PDF document text
    • https://cdn-cms.f-static.net/uploads/4464072/normal_5fa55aa1b6d53.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/tokafanawa/94720262022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79da63e8-4388-4331-9abf-545ea00bf306/mcgraw_hill_sat_math.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5043183-f09c-48ec-9ac6-36d7f758a558/96028404855.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/58111738845.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/you_should_be_a_witness_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/263eb769-a461-40df-b38b-369143dfff73/vikevibuneder.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b7a82b-79ff-4865-b36e-8bfde2f7bc5a/ruvuvapakal.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e9036b97992eb55c1f46/t/5fc0f77364571256545e258a/1606481780969/75327272959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/471b2e28-4537-470f-91bd-f9a37bf85f20/94070998019.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/agatha_christie_obras.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_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 5280 bytes
SHA-256: cbd1ecd0e3b6d5991647183191407c83594c6f81584c3a0749c8d8396671f3e3
font_01_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 11448 bytes
SHA-256: 7af237616360b05b0f911064c2fb3905b22724f83c23ab11edf3c0405bd0bab4

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