Malicious PDF — malware analysis report

Static analysis result for SHA-256 924eb5d8e99de22b…

MALICIOUS

PDF

83.3 KB Created: 2021-03-04 19:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2744596c84d7ff68b391c482ca5da831 SHA-1: b5452a6a1ff327cfa6b297b8c484c5272c5ce800 SHA-256: 924eb5d8e99de22be0cfc84082f766bceed60c0fc967d8d5088784eae4eb4009
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, with ClamAV identifying it as a phishing trojan. The primary attack pattern involves a link farm, with numerous external URLs embedded within the document, directing users to potentially malicious content. The presence of SEO-optimized links suggests an attempt to manipulate search engine results for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=process+dynamics+and+control+4th+edition+solution+pdf
    • https://bisetegu.weebly.com/uploads/1/3/4/5/134528498/towubazosepuna.pdf
    • https://cdn.sqhk.co/rapedipular/ccjhjgh/90988145797.pdf
    • https://cdn.sqhk.co/befulirawid/SAiaiib/15295038771.pdf
    • http://zinepifulew.22web.org/big_little_lies_series_2_episodes_how_many.pdf
    • https://cdn.sqhk.co/xifinelire/jhegcgd/95467707652.pdf
    • https://cdn.sqhk.co/vuvupewog/bh8iiig/wallpapers_scooby_doo.pdf
    • https://cdn.sqhk.co/lisutovudaf/v6hbgg6/hollow_ball_dog_toy.pdf
    • https://cdn.sqhk.co/lagitesavap/21wgdge/59838630737.pdf
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/nijisiravejetidurun.pdf
    • https://cdn.sqhk.co/jarixizotib/XKjiara/how_to_cake_it_pineapple_simple_syrup.pdf
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/1292401.pdf
    • https://cdn.sqhk.co/zodunoxurob/ie5jfhf/41836217259.pdf
    • https://cdn.sqhk.co/guzoladip/iduwea0/ponizuparasudakuj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wovisak/apk_blibli_versi_lama.pdf
    • https://uploads.strikinglycdn.com/files/27b05fb7-53e4-4cf8-9223-332818c3fcb0/best_setting_for_automatic_watch_winder.pdf
    • https://s3.amazonaws.com/garorowa/technical_analysis_of_the_financial_markets_by_john_murphy_download.pdf
    • https://s3.amazonaws.com/tutasujal/44625501814.pdf
    • http://zeduvekitodili.rf.gd/76732340674.pdf
    • http://leribilif.rf.gd/26424670770.pdf
    • https://uploads.strikinglycdn.com/files/d5a3f769-0479-48be-85a7-fde4098231ca/41027071086.pdf
    • https://s3.amazonaws.com/vidadaviwal/jezalaxagexodinu.pdf
    • http://ditaxaj.rf.gd/download_inkscape_untuk_windows_7.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e303.bin
42638ea0d7bd7b8305f46c3b95487ff42c96adfb8211aad30eb1de6af3a239a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 5588 bytes
font_01_sfnt_off0000f5ea.bin
838fbab311ee90690f48d9ab2b9d7f52ec2f1a040083da821385abdc3e1acd3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 15676 bytes
font_02_sfnt_off00012742.bin
8c2c54158af3fd3dac0a0a8f959735eacc280369b89a2cc1043161067f9e216b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16220 bytes

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