Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbdc76713322fd3…

MALICIOUS

PDF

100.8 KB Created: 2020-11-24 05:57:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1df762b4bbb2a5d3afd8dc29d2f21b30 SHA-1: 8acccad7a7979d375668d5e78447eb619f5ca52e SHA-256: bfbdc76713322fd3d77e622755e47c42500c83eb401b5fc770c992b2222d0c9e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is part of a link farm designed to direct users to potentially harmful sites. While no scripts were extracted, the structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://cctraff.ru/strik?utm_term=kitab+ibnu+taimiyah+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369138/normal_5f885911be3c0.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/timomagijur_kirasigizuvid_jedititowanu_giwev.pdfIn PDF document text
    • https://waxalema.weebly.com/uploads/1/3/4/3/134364729/1211484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fb8cc9935a9b.pdfIn PDF document text
    • https://xivenisulebitok.weebly.com/uploads/1/3/1/3/131378814/sulokamivejivo.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/4765241.pdfIn PDF document text
    • https://wetuxabo.weebly.com/uploads/1/3/0/8/130873937/d61ea472ea9420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_5faf6c542a649.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5fb9f4193809f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419628/normal_5f968053273ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414341/normal_5f9d06d9ea11f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed08ff80-e778-483e-9ff0-f685d6b2c236/18155928586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8027fb64-7aaf-4904-a9d3-5b8680cee14a/common_and_proper_nouns_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/41941127307.pdfIn PDF document text
    • https://s3.amazonaws.com/pogolo/53700608545.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000110cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110CD 4376 bytes
SHA-256: 282e4247550e866c58ecd3e0a3875e5b27af185a4043b94e427210cd2d294441
font_01_sfnt_off00011ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFA 5188 bytes
SHA-256: 59bce5dafd92c8620093c0cad9f77bc93e08713f65a30b6671c48ae17f8e25fc
font_02_sfnt_off0001317f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317F 6296 bytes
SHA-256: 554f6a3b77d2cfba3f7ac636b8eaca6e6826a54bfe8462f7d8109b38da3c206d
font_03_sfnt_off000141eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EB 2004 bytes
SHA-256: 35cb21fdb618efd7041eee26779fe95fdf0a80cdc9fe6086b0d69ce776a47990
font_04_sfnt_off00014b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B81 10668 bytes
SHA-256: 9cf4eeae9c833c72d6978c26363ca824d8e436908760f74f9dfb1e1a16950cc6
font_05_sfnt_off00016f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F89 16096 bytes
SHA-256: b116d555496960b1001cf6c696eea8d4db69ac652c8811f9a70fd582a21e1c02

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