Malicious PDF — malware analysis report

Static analysis result for SHA-256 64633aff96ac0202…

MALICIOUS

PDF

74.2 KB Created: 2021-03-06 10:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5f163e0908fb90389cbf8042eeb7c0d SHA-1: 7d24d3ca09f4ced83b72022deff6930d1d2ea0c3 SHA-256: 64633aff96ac0202882f4ef9a81bdf63bffcc23053ca5e53b2c0b86e4d52964f
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/wix?keyword=blue+colors+that+start+with+j
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd36e2e67f4e.pdf
    • http://likefetevu.getenjoyment.net/most_important_topics_in_physics_for_jee.pdf
    • http://zudetubakameg.iblogger.org/dalasavebepeji.pdf
    • https://cdn-cms.f-static.net/uploads/4464724/normal_5fd881a27f535.pdf
    • https://static.s123-cdn-static.com/uploads/4368223/normal_6002f15ad91af.pdf
    • https://cdn-cms.f-static.net/uploads/4393904/normal_6009f1ef4fa3c.pdf
    • http://woronari.getenjoyment.net/smart_board_for_online_teaching_price_in_india.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_ebbda60758d247a9abfc3d326a84d7f3.pdf?index=true
    • https://cf587a47-7c2f-4f55-8bbb-21a4c73503f7.filesusr.com/ugd/8ea597_57d1e55e08884d3781822fa89fed933e.pdf?index=true
    • https://s3.amazonaws.com/resabomibogodaw/karen_tyler_court_reporting.pdf
    • https://s3.amazonaws.com/bidivo/sepalivegib.pdf
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_efa0f526210a43cda5b86d7ca753dd1e.pdf?index=true
    • http://gelanuvefod.epizy.com/povokegukim.pdf
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_9ac725413a1d48f4b685b13d533299cb.pdf?index=true
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_699dd5df0c234c5abf953edb5e6f9f7e.pdf?index=true
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_58df55674bda474ebbae0aab1e250c8e.pdf?index=true
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_e769d174ef7144558847d67e0fb28b88.pdf?index=true
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_b3529d0a4c1049d8853be55361b54977.pdf?index=true
    • https://s3.amazonaws.com/nefomojuwet/access_bars_livre.pdf
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_123e937e303f4d5fa00cfb5b45c713d1.pdf?index=true
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_4ad866a1fc144a998e6c27d87675d2ee.pdf?index=true
    • https://s3.amazonaws.com/zodawanuror/employment_letter_template_doc.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_off0000e63e.bin
2d2b7d5fa7db8e3a0c44ba61a2779d0015b3fde270b3eba816c42f9819550469		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5104 bytes
font_01_sfnt_off0000f7a9.bin
fabf85d04d11810e8a1ca8a28f7dc7a4e5d7742495954027113071add68c4ab2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A9 10492 bytes

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