Malicious PDF — malware analysis report

Static analysis result for SHA-256 74efdbdcac547699…

MALICIOUS

PDF

69.5 KB Created: 2021-02-26 22:26:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb6f0cb9cae091e6564ce459f1c3a1e SHA-1: dc0eff935ba911fae00af2f9b9d1cb7a59a61e3a SHA-256: 74efdbdcac5476993b43689efbacd22c83edac7539becf8a4d0d845309b8793c
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely intended to redirect users to malicious sites or download further payloads. The presence of embedded URLs further supports this, with one notable URL being https://druttle.ru/123?utm_term=fisher+price+6v+swing+ac+adapter+power+plug+cord, which appears to be part of a link farm.

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://druttle.ru/123?utm_term=fisher+price+6v+swing+ac+adapter+power+plug+cord
    • http://xogunajeraxuda.mywebcommunity.org/68859306377.pdf
    • https://cdn.sqhk.co/vodadavubex/T2jihdr/vesofolunevatiji.pdf
    • https://cdn.sqhk.co/fipimomozuk/u6i5id6/game_center_login_iphone_x.pdf
    • https://zotagozugub.weebly.com/uploads/1/3/0/7/130739891/744bf741c02.pdf
    • https://cdn.sqhk.co/kexofodatop/ghjhijb/tuxoxani.pdf
    • https://cdn.sqhk.co/tunuviju/Ijegehb/15137479679.pdf
    • https://cdn.sqhk.co/ributexovek/JB2ghji/buwuzaviru.pdf
    • http://fafesixokegigi.getenjoyment.net/da_form_4856_bar_reenlistment.pdf
    • https://cdn.sqhk.co/gimexigerub/hcJjcU9/heroes_of_magic_card_battle_rpg.pdf
    • https://cdn.sqhk.co/juzurupivepo/hjggthi/67545446797.pdf
    • https://tukadivi.weebly.com/uploads/1/3/2/6/132695248/zonumavaxu_pujemikakufura.pdf
    • http://suzamajotibe.mywebcommunity.org/55642652921.pdf
    • https://genebametujo.weebly.com/uploads/1/3/4/9/134904617/059bfbfb3.pdf
    • http://hhizmet.com/pavodusffgxr.pdf
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/4791528.pdf
    • https://cdn.sqhk.co/duburijudi/jhicCgd/nudolelaka.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://futikuzita.onlinewebshop.net/polaris_280_parts_wall_fitting.pdf
    • http://kivozusemu.atwebpages.com/symbol_ls2208-sr20001r-ur_driver.pdf
    • http://vexolofifete.atwebpages.com/wizards_of_the_coast_retail_store.pdf
    • http://xuxerutiwuv.onlinewebshop.net/92072888128.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_off0000cee1.bin
dccd40dc092c36b916f9fae08ecc17be18f81715e22a0e34e1c250602351b49d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE1 5596 bytes
font_01_sfnt_off0000e1fc.bin
f58b4c08ba6bc6fff473ec578389d063043da36794f98dd5400b313c5a2a8e75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FC 10884 bytes

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