Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4d1cf882594f02…

MALICIOUS

PDF

78.1 KB Created: 2021-06-05 09:06:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7efc8464561a4b4253f8d8e439c4df4b SHA-1: 403f568c2cb7a7006497a8fa7bb78faa9b6e66fa SHA-256: 8f4d1cf882594f022bad52c6ff443612956e483199d0c3cb4dee6911c6766987
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'how to remove dust shield'. The presence of multiple external URLs indicates an attempt to redirect the user to potentially malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://laborke.ru/pbw?utm_term=how+to+remove+dust+shield
    • https://static.s123-cdn-static.com/uploads/4468550/normal_5fe02fbbd8032.pdf
    • https://setowunujabid.weebly.com/uploads/1/3/4/0/134095848/jefawipozanezos.pdf
    • https://ruwuzeget.weebly.com/uploads/1/3/4/7/134755445/7427499.pdf
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/rulemifesexirel-wilopapuv-rafiru.pdf
    • https://cdn-cms.f-static.net/uploads/4369331/normal_602a23c679f00.pdf
    • https://tadiseregofinu.weebly.com/uploads/1/3/4/7/134748358/529a59aa87c77f7.pdf
    • https://cdn-cms.f-static.net/uploads/4387232/normal_606c2f5182586.pdf
    • https://static.s123-cdn-static-d.com/uploads/4496015/normal_60b1d5eb25b7d.pdf
    • https://static.s123-cdn-static-d.com/uploads/4477367/normal_60b6d5ef42cda.pdf
    • https://static.s123-cdn-static.com/uploads/4381101/normal_5fe4fd5ab1f87.pdf
    • https://cdn-cms.f-static.net/uploads/4458148/normal_606450677c36e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://gibuwodebu.pbworks.com/f/18329206644.pdf
    • http://jetipufagi.pbworks.com/f/brothers_full_movie_telugu_surya_watch_online_movierulz.pdf
    • https://uploads.strikinglycdn.com/files/53fc9ee1-394c-4755-ab46-ab532a15e400/kesanenatefezof.pdf
    • https://uploads.strikinglycdn.com/files/62269e08-cf4f-4025-bdae-93d7cb63a43c/how_to_transfer_a_car_title_in_oklahoma.pdf
    • http://rixepal.pbworks.com/f/evermore_beauty_and_the_beast_piano.pdf
    • https://uploads.strikinglycdn.com/files/5f3c352a-2193-4492-a15a-45caea8cac7d/taurus_pt111_serial_number_location.pdf
    • https://uploads.strikinglycdn.com/files/efe59de9-0c14-4243-99ea-fe2be90dd812/5727673865.pdf
    • https://uploads.strikinglycdn.com/files/cafd81cb-f11d-49a3-a3ad-f36b88981d60/how_to_hook_up_samsung_soundbar_to_roku_tv.pdf
    • https://uploads.strikinglycdn.com/files/b5fac2b2-aaf3-45ce-8d6c-173c7967ee4a/fidabew.pdf
    • http://vamafob.pbworks.com/f/sexeluwaw.pdf
    • https://uploads.strikinglycdn.com/files/8a366329-5d55-45c8-9268-39c6dce7e9a9/problemas_de_matematicas_sexto_grado_para_imprimir.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e761.bin
e1b3bd542940a0514aa8d69ff150b6f9d676d9a2f6e0f7f5e1582e70d7db6d2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 4744 bytes
font_01_sfnt_off0000f795.bin
8a666af896dd211f209b6a7174877832f866af44e532864a1ee066a12c0e21e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10952 bytes
font_02_sfnt_off00011cdc.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDC 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.