Malicious PDF — malware analysis report

Static analysis result for SHA-256 59737a0d63d6d2ca…

MALICIOUS

PDF

76.9 KB Created: 2020-12-22 00:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 53a41985651c0a72b9d355ff0cefdb45 SHA-1: 598e46489c791a5ea738b94fdb12be6aef30a9c6 SHA-256: 59737a0d63d6d2ca96b7059644ae2d6abc979d50ce61670e49041045d6a61798
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware-distributing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/123?utm_term=extracurricular+activity+definition+easy
    • https://cdn-cms.f-static.net/uploads/4366035/normal_5f880dc5f0693.pdf
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5f97a9873c65e.pdf
    • https://wuzesitawe.weebly.com/uploads/1/3/4/7/134733123/f4660e.pdf
    • https://cdn-cms.f-static.net/uploads/4404953/normal_5fba47166bbf4.pdf
    • https://rulafusojuxibaw.weebly.com/uploads/1/3/4/2/134265871/fazewogepeximed-gipogawabijowel.pdf
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/gasoxikat.pdf
    • https://cdn-cms.f-static.net/uploads/4460228/normal_5fbc2e8a00beb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc6db42504bb4653ce19d0c/t/5fcd4ebc74a40730fba8140e/1607290557571/reload_globe_load_wallet_online.pdf
    • https://static1.squarespace.com/static/5fc4ce616609fd0ee7aa78df/t/5fd6584f72b1137fa9747bd4/1607882832720/zisibuvekokizeguvimabogux.pdf
    • https://static1.squarespace.com/static/5fdf16f5297e1070131db6b5/t/5fdf78aa42c0045a330f860f/1608480939073/56293911894.pdf
    • https://static1.squarespace.com/static/5fdc9c274a508b35dd5dc321/t/5fdcb198ec23fe111c61643c/1608298904928/most_graphically_demanding_android_games.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1f2.bin
abee0b898b1ec7ae6b1fda0c75d23d44e051b725a142e0026a65b6b47583334b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F2 5204 bytes
font_01_sfnt_off000103c9.bin
ce972e61190acd993492a02502defdb721b015d03e0ba02813823c73638f1fe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10364 bytes

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