Malicious PDF — malware analysis report

Static analysis result for SHA-256 764866e89009d0ed…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 18:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d22c5f09b1552121768bd0459ce17b0 SHA-1: e893468cae11b400e55be546f7ddece85d5dd011 SHA-256: 764866e89009d0edf40fd9d9338e26a7d4f36817b75388c9116ecd7f14cb55d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious content. The PDF structure and embedded links suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://windsbs.biz/files/file/38114718600.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1f58b53db2a824c2e735825d7006a98f/gisisodofazudobebetino.pdf
    • http://lohoithaiduong.com/uploads/files/dasevufotuborukowiledere.pdf
    • https://almudenafernandez.co/ckfinder/userfiles/Files/wogokiwuxigekadivisisomiv.pdf
    • http://xn--z92bzy85x.com/userData/board/file/84215210236.pdf
    • http://jubileejec.com/userfiles/files/75763986687.pdf
    • https://cobaltinc.org/userfiles/file/xiwokame.pdf
    • https://satesayap.com/contents/files/62765666090.pdf
    • http://alphanaturehk.com/userfiles/file/71539523894.pdf
    • http://www.ap-arte.ro/fckupload/file/40100051903.pdf
    • http://sibinetweek.ru/userfiles/file/20859936517.pdf
    • https://calendarsunrooms.com/userfiles/files/54314627584.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/27893425452.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/omhctab7kt7a94vf2dnkc2ik05/78714745561.pdf
    • https://tractorpulling-emmeloord.nl/upload/file/zafasekimesejejanaferuje.pdf
    • https://airin.lv/images/userfiles/file/20874642243.pdf
    • https://megalightgroup.lv/uploads/files/texemogutufulupesesukod.pdf
    • https://maconlux.ovh/userfiles/files/dewivewo.pdf
    • http://gmicropilotes.com/uploads/files/waropulupon.pdf
    • http://naturallabs.fr/userfiles/file/25861389455.pdf
    • http://pinxedien.net/upload/files/sosidarumesidazizebiwanos.pdf
    • https://sanipacific.com/attachment/file/budin.pdf
    • http://technoprofile.ru/userfiles/file/kixeteluwemu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=daily+data+usage+android
    • 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://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_off0000c98f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 16792 bytes
font_01_sfnt_off0000e1a6.bin
d49e87e40f551fb58b92f2b5e78007757cf36f9a1d1990d57a216298c866b939		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 10640 bytes
font_02_sfnt_off0000f9e7.bin
11d3e93051b5fca0f8f1939a76ef829464699a1c38eac93ec713988ff9ad7459		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 17176 bytes

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