Malicious PDF — malware analysis report

Static analysis result for SHA-256 72dc91f29ea25561…

MALICIOUS

PDF

67.2 KB Created: 2020-12-26 17:01:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7f377d47ad1ff7d9697d2c32d0b98422 SHA-1: 6c999bd4cb2a2ea0a3f04e71d830bb098a0b516a SHA-256: 72dc91f29ea25561641f0574492b5d9b6b7eae77e596b11cf9a4caf99a4b15af
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 a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'Wordscapes level 8086'. The presence of a link farm and a malicious redirector suggests the primary goal is to direct users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=wordscapes+level+8086 In PDF document text
    • https://karesaxu.weebly.com/uploads/1/3/5/3/135392924/566a9e.pdfIn PDF document text
    • https://kenixusosud.weebly.com/uploads/1/3/4/7/134772303/luzak.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/ada0a9b5ac9d474.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/2520011.pdfIn PDF document text
    • https://vasukoxenubepez.weebly.com/uploads/1/3/4/4/134475355/fc97b7ff52e0dae.pdfIn PDF document text
    • https://xalitizamer.weebly.com/uploads/1/3/4/8/134863297/9791588.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/970d320b-bd7c-472c-b2bf-4c9762f820ac/tasemewalesezu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05e9b626-822d-4f22-b819-14b41bb8cd95/toad_life_cycle_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/roxawo/11498052202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc9897c0-624d-4f1e-bf77-32a6668ec74d/17645656806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ccf17c6-215e-4f0c-8a7a-bc282a15a0fe/82927221836.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e01b54-203f-4155-94c1-597afa9fb2f9/24177954569.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_off0000c9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DC 5628 bytes
SHA-256: d0b10d86f4e7ec4910453788541062c84f65a537e5ab09c5e1cfbd9e34390141
font_01_sfnt_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 10232 bytes
SHA-256: 7b233cccfbeb8aa5ba1fe3bef50e05d124f2d433b0be7bebcdbdbb4cb2e2c5c3

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