Malicious PDF — malware analysis report

Static analysis result for SHA-256 456e9847bf7de6de…

MALICIOUS

PDF

70.9 KB Created: 2020-12-14 12:15:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe2ba94012823cf13b385e106e2b90e5 SHA-1: 5308cb25044837efd12853c53521a10a408a7d37 SHA-256: 456e9847bf7de6de7fc314df78348ecb49ba69ea39116bfdb887584d24b5b27f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical finding for a PDF link farm containing numerous external links. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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/123?utm_term=kimonos+menu+winston+salem
    • https://mepanomelisegil.weebly.com/uploads/1/3/4/8/134899905/wugel-kalusami.pdf
    • https://cdn-cms.f-static.net/uploads/4379616/normal_5f9e31e18f41b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c5002f79-7532-4ab8-8675-b7bdf59ac713/48534603023.pdf
    • https://uploads.strikinglycdn.com/files/83a7e99f-2734-4201-8a63-3d2253baaaa4/let_it_be_drums_tab.pdf
    • https://uploads.strikinglycdn.com/files/35279b5f-a5d2-45c0-8ac2-33730b14d931/13311266827.pdf
    • https://uploads.strikinglycdn.com/files/a738dd2b-a58d-4086-bc7f-2d1c84a7ec97/download_free_music_the_heavens_declare_marcello.pdf
    • https://uploads.strikinglycdn.com/files/6be0d5a4-19c7-4531-bf8b-4e1d6b66a0f4/kaxutapi.pdf
    • https://uploads.strikinglycdn.com/files/4f781555-e438-4f2b-acbb-323b25b90889/asus_ve228h_manual.pdf
    • https://uploads.strikinglycdn.com/files/33a9f0da-3e57-47ec-9f22-3cca1902ef42/voxufijojumorusisonimi.pdf
    • https://uploads.strikinglycdn.com/files/62a9d1da-f64c-407e-a5fe-a16273371d78/esuchen_hair_care_products.pdf
    • https://uploads.strikinglycdn.com/files/b0f4745c-d626-4730-aab4-e79f6b415542/xuvikefufatujuzipafoz.pdf
    • https://static1.squarespace.com/static/5fc50f372e537a05ef23cbd8/t/5fc68c6d2dd96f5918d152fe/1606847598373/self_respect_quotes_images_in_telugu.pdf
    • https://uploads.strikinglycdn.com/files/3ea238c7-0191-4c40-ae07-919c42ab9575/introduction_to_hydrology_viessman.pdf
    • https://uploads.strikinglycdn.com/files/a79471cd-78e6-4009-a6aa-1336b8742c20/33061316255.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_off0000d066.bin
08462cb32d3e1f455330226ab5dd20167be63c20faa2977c68d0d32ac0b3a8d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD066 4796 bytes
font_01_sfnt_off0000e0b9.bin
960fe120f5d8ae471203a20121cbc9df43c728d172c1590b1d1c330dfbbf3549		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B9 13012 bytes

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