Malicious PDF — malware analysis report

Static analysis result for SHA-256 79916dcd598bba2f…

MALICIOUS

PDF

67.9 KB Created: 2020-12-17 20:52:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 4dcc080ad8fbbb2f6c088c3ddba54d6b SHA-1: 232cd3a9a10bbc8c07ed1b2a074eb1a1036d805e SHA-256: 79916dcd598bba2f6d69460b6a003f729593a085b15d123f5826a3ffcb62ba33
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan delivery. The embedded URL and the document body's lure of 'free gift card codes' suggest a social engineering tactic to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=google+play+gift+card+codes+unused+2019+no+human+verification PDF link annotation
    • https://vizomitula.weebly.com/uploads/1/3/4/2/134266598/9718293.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/wopapezu-pabanizo-rejekidajisilal-vugalasovarev.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/zakunafu/physical_anthropology_study_guide_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da20ef52-d117-4094-b776-f5acc1e2dc8b/67379641961.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/arjun_reddy_movie_tamil_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/387439e1-1d20-4fec-96b3-036f1915164a/reengineering_the_corporation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dd1645-3b08-439d-96a8-d9a2cf320504/85173166769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f090bd3b-9015-4e46-b6ee-6852c6536378/diwev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e875d79-f9f9-4441-b750-5a542804dff5/73013616931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/438b6b5f-738b-4f2d-85cc-591608b778a7/uldir_minimalist_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf542d61e25426e12f7ae9/1606374448202/wovew.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_off0000c911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC911 6244 bytes
SHA-256: 9a63a836dbe43f0cd8d952af4431c480d125fee9b34a35f4fedceb58b050e08e
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 10660 bytes
SHA-256: 496979eb16f258608f91161bf96825316fa98dc1e139d4c1f815d3a3e95ca5c0

Open this report in the interactive analyzer, or submit your own file for analysis.