Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97994b084ba6f14…

MALICIOUS

PDF

93.8 KB Created: 2021-02-20 03:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 993284bb03de664611bfce288702fcf6 SHA-1: 401c36d332bf8b9852d579182ffb72f1a35643d3 SHA-256: c97994b084ba6f14f0356b3f5cd44105a84e1e50018eb3c5fe1b878b787c983c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is a PDF document that contains multiple external URIs, many of which point to link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download' lure heuristic further supports this, suggesting the document is designed to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://leonvi.ru/strik?utm_term=textbook+of+anatomy+and+physiology+for+nurses+ashalatha+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/pexufenek/j2rjbtD/world_war_1_games_unblocked.pdfIn PDF document text
    • http://xonibiz.22web.org/jozolu.pdfIn PDF document text
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/watobef.pdfIn PDF document text
    • https://razomidubijime.weebly.com/uploads/1/3/4/3/134395635/b85a52.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/hh2bwih/52094162715.pdfIn PDF document text
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/xaxebo.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/njiichg/61584185099.pdfIn PDF document text
    • http://madusotiju.22web.org/pigenu.pdfIn PDF document text
    • http://rutomatuwusu.22web.org/6112286292.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liwusetokabozil.epizy.com/texas_cottage_food_law_taxes.pdfIn PDF document text
    • http://zubafazebet.epizy.com/xudaxumuzewuzomigojotulux.pdfIn PDF document text
    • http://surafupomef.epizy.com/89341963942.pdfIn PDF document text
    • http://rixogapokat.epizy.com/how_to_clean_nordyne_furnace.pdfIn PDF document text
    • http://zagiwis.rf.gd/wikisovorogevutibaxaga.pdfIn PDF document text
    • http://xojakejib.epizy.com/boboiboy_galaxy_episode_19_sub_indo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 6724 bytes
SHA-256: 5334fae193d7f5509c80f1ea06ed340eded6bb14bbf476b1de2041f541dc0481
font_01_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 5868 bytes
SHA-256: 414f78d0c3c6a98429073aa8e631a363b14ad678f4a72957360ff331038353c6
font_02_sfnt_off00014249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14249 11348 bytes
SHA-256: 3413e1518e2df92417528d63eb4503a16dba25ff48b10d23c088b7004ec42c1c

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