Malicious PDF — malware analysis report

Static analysis result for SHA-256 70b477809a238f62…

MALICIOUS

PDF

90.8 KB Created: 2021-04-04 00:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79c1b05c4fe14f167bf658b1a70a538d SHA-1: 1e6a60d3f47bea7cbcfd2b9f5c8af5da8a7f734d SHA-256: 70b477809a238f62970fb069131d8b0714fe3728083bd46aec963550093aefd8
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' designed for SEO manipulation. The presence of a 'download button' lure and a critical ML classification further indicate malicious intent. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content or download further payloads, potentially related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=wayne+dalton+idrive+torquemaster+troubleshooting
    • http://mesretly.xyz/jopawitoxt5dg0.pdf
    • http://bosnoslovnoejelaniekupit.xyz/gugunepunonipabuj84zj.pdf
    • http://leree4.club/barenexivyzchk.pdf
    • https://cdn.sqhk.co/gorusuvu/Qjigihb/closed_cell_foam_sheets_south_africa.pdf
    • https://cdn.sqhk.co/nolovojawek/aUggecX/elifoot_19_20_pro_para_pc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lorifumofelu/nolatufopow.pdf
    • https://s3.amazonaws.com/difigomisosak/tebepudajudikegipi.pdf
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_1fcda31b268b4791a5dc185793bb6830.pdf?index=true
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_d31a33c9d5c3438dabea9607f7275ac8.pdf?index=true
    • http://sezajurul.epizy.com/26397173782.pdf
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_853fa9f3b4ac41e7b6e3638c3f4520c6.pdf?index=true
    • https://s3.amazonaws.com/regegozumekoza/73805499337.pdf
    • https://s3.amazonaws.com/lanorolowu/baloretabatadevegedifur.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_120768dde3444057ac1a92d607b1be01.pdf?index=true
    • http://bilunet.rf.gd/dopatixovim.pdf
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_ecb1626c54264d21ba20c3bf8f40e0d2.pdf?index=true
    • https://s3.amazonaws.com/xopugup/ledinajutiwo.pdf
    • https://s3.amazonaws.com/musokejixami/lonelaliramog.pdf
    • http://masokijedeneda.epizy.com/balance_sheet_equity_calculator.pdf
    • https://s3.amazonaws.com/tiduro/britax_car_seat_manual_marathon.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_off0001241c.bin
4be663331fa450b3a01445b41a7737a2d53ba4da78b5b44b3faff9d7fe04a7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 5680 bytes
font_01_sfnt_off00013752.bin
c33bc4f6f6f560e5c6ab1654c55300f47efc6ffda9c7232afa6f21c69c711a69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13752 11288 bytes

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