Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cd69e341d9df496…

MALICIOUS

PDF

78.8 KB Created: 2021-03-20 13:57:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878b2be53adf39962165872e167e831e SHA-1: 5739fc2cd61b9bcf0b21dad806ed859a51a71879 SHA-256: 1cd69e341d9df496f0cfdab4e2f8f2e3fb48c35bd88c6fcbb966001e7ffe43af
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. The document contains a large number of external links, suggesting a link farm or phishing attempt, with one URL specifically appearing to be a search result lure. The presence of embedded URLs and the overall structure strongly indicate an attempt to redirect users to malicious sites, likely for credential harvesting or malware distribution.

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://mezovuduw.ru/wix?keyword=a+long+walk+to+water+chapter+questions+and+answers
    • http://ruperamumafuvaz.22web.org/zanimumuz.pdf
    • http://salonop.xyz/behringer_eurorack_ub802_review4gnjh.pdf
    • http://megatorg.ru/favubebogavebolai3on.pdf
    • https://static.s123-cdn-static.com/uploads/4413848/normal_5fe445a3b5a5b.pdf
    • https://static.s123-cdn-static.com/uploads/4502493/normal_5fe44d6ac9e08.pdf
    • http://walletelectrum.buzz/88932423023k32kd.pdf
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5ff4e1067aa7f.pdf
    • http://flowerport.shop/197893283613av0m.pdf
    • https://cdn-cms.f-static.net/uploads/4426267/normal_602604bf3352f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://dogefifuga.rf.gd/povol.pdf
    • http://vawinujofupin.myartsonline.com/36425099400.pdf
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_6967c45bb5e54712b13ca47a639c429f.pdf?index=true
    • https://69868269-04aa-4a0d-8379-1371762fd556.filesusr.com/ugd/d8beff_0aa563a80a3f4c549410d1de61f4a77b.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_2054e80562fc48539ca1bea954ff6dc9.pdf?index=true
    • https://ab9101c8-a046-40a0-ba79-761bab9f3367.filesusr.com/ugd/61fb7c_8e73162685dc44f7b974d55361b5fd6f.pdf?index=true
    • https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_e63dd4b1d057467999c9107dbcba4afa.pdf?index=true
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_956fa6e08629489cb3dc8f4766abe164.pdf?index=true
    • http://pogetowem.onlinewebshop.net/segagelarudupewajovunad.pdf
    • http://numaripokusuj.rf.gd/acorn_stairlift_service_near_me.pdf
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_85380b702a084e85b3e8c172aeb3c747.pdf?index=true
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_4aa3a45e32044bc6848a3933b112b067.pdf?index=true
    • https://d0bf7e8b-5449-41c0-93e9-161603c0719f.filesusr.com/ugd/197ed4_d42ce1acfa6744e996bc45eac454ae1e.pdf?index=true
    • 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_off0000f637.bin
81f3954da524901cbfa4088f94894fe4835752a872892f2ce97e6d4db6e38b0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 5608 bytes
font_01_sfnt_off00010957.bin
5578f3882bd44612f5055f15c85bb52ce63e28b29eda849dc25da005d5f8c5a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10957 10620 bytes

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