Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a9759d2656ba2f…

MALICIOUS

PDF

70.0 KB Created: 2020-11-17 04:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 52723321c313a2c0d64f020c935d3675 SHA-1: 3d66256da5d74d8c8f50979c263c7556491a87af SHA-256: f7a9759d2656ba2fe343b6665a7f72bae053bf2bfd573e5bf36c2eb393875cbb
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content. The presence of 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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.
  • 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://traffset.ru/123?utm_term=puesta+del+sol+pta PDF link annotation
    • https://xodalolekuxol.weebly.com/uploads/1/3/4/1/134108590/9215235.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/3546336.pdfIn PDF document text
    • https://witudaki.weebly.com/uploads/1/3/4/3/134332653/692baa.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/3371310.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/vuzipabujunaxi-segedimusot-ligijiroli-ripapuf.pdfIn PDF document text
    • https://wesujugureju.weebly.com/uploads/1/3/0/8/130874517/sinuvoluwulotezomavo.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.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/b37ede85-d481-4f26-a92c-95d4e155c2b8/flash_boys_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/dnd_5e_arcane_trickster_cantrips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/257afe36-dc6e-466f-99ab-4ed856825177/puwoguzemaj.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/no_man_knows_my_history_quote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7057a7d-cd15-46fc-9b00-3bc0a5994f83/papa_murphys_cookie_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/nubewijibuli.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_off0000d261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD261 4856 bytes
SHA-256: a551f6cf5ef42f462c45d5fd76b5032274bfdebdfbc0780e6e5f33616945c149
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 12456 bytes
SHA-256: e3c66ec34d305fd7544818d7e531f8b998a673d93968bee9d53e52e21288ece0

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