Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e98c28c0bd4256e…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 15:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9d1335f96a28369f1d125f2161d9209 SHA-1: e813317b1888a7c83d4d27e883e2cfdf3a85ec5a SHA-256: 2e98c28c0bd4256eae37e36e8edf72ecde8ff3440ed349d165b15fde68613c74
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of a large number of external links, identified as a 'PDF_SEO_LINK_FARM', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf', indicating it was likely generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=kotter%2527s+eight+step+process+for+leading+change
    • https://cdn.sqhk.co/soxuwutitaw/hiciagi/search_wikipedia_from_chrome_address_bar.pdf
    • https://cdn.sqhk.co/rijomawonuj/j5ZFppB/30808901867.pdf
    • https://cdn.sqhk.co/sozaxejiv/jiijMv1/lafagajodukola.pdf
    • http://islemleriniz.org/luxusijaxafaxeselanugen5u1m5.pdf
    • https://zixavuxo.weebly.com/uploads/1/3/1/3/131398386/6dd368d7e6940a.pdf
    • https://dabosimupit.weebly.com/uploads/1/3/5/3/135397997/rosedon.pdf
    • https://cdn.sqhk.co/zaviresodew/hbvijif/gamepad_para_pubg_mobile_ios.pdf
    • http://ighelpcenter.xyz/what_does_self_knowledge_meanbazpe.pdf
    • http://mavito.online/what_is_the_function_of_the_oxygen_gas_required_in_aerobic_cellular_respirationlukmx.pdf
    • http://kompledom.com/66234836606qotd6.pdf
    • https://static.s123-cdn-static.com/uploads/4426424/normal_6007f306ba9ac.pdf
    • http://donbetosstreettacos.com/bopebixipezabvvkti.pdf
    • https://xojakonokixamu.weebly.com/uploads/1/3/1/1/131164577/8604572.pdf
    • https://cdn.sqhk.co/dojaxeje/yhjijPj/turn_based_racing_game.pdf
    • https://kaxogirigajel.weebly.com/uploads/1/3/4/6/134611066/5999799.pdf
    • https://cdn-cms.f-static.net/uploads/4481055/normal_6019d7404176a.pdf
    • https://cdn.sqhk.co/bamosabubesi/giicFid/ribuluzunuduno.pdf
    • https://cdn.sqhk.co/xasurila/7hjAggy/hocus_pocus_book_of_spells_cake.pdf
    • https://cdn.sqhk.co/negapevu/fIjaY0V/train_simulator_nvidia_control_panel.pdf
    • https://cdn.sqhk.co/jalotenabo/NJhcjh2/92835600195.pdf
    • https://kabenodetaxixum.weebly.com/uploads/1/3/4/7/134754863/vosawabawit.pdf
    • https://cdn-cms.f-static.net/uploads/4381090/normal_60507d3193f33.pdf
    • https://cdn.sqhk.co/zuzudumijamo/jehhhCz/12289325718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farokof/geankoplis_c._j._transport_processes_and_separation_process_principles_4th_ed._prentice_hall_nj_2003.pdf
    • https://s3.amazonaws.com/gewisetug/54001947760.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_off0000f9e9.bin
86620e2b67bfb8bdfe5a97525fe06f5360946df7cf7548b725af845cb463fe26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E9 5420 bytes
font_01_sfnt_off00010c5d.bin
333cf7f2e76c9b3233f414939416d1ceebc1a1d0822397d120305c4601f2e15c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 10508 bytes

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