Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9517ad4da13e1aa…

MALICIOUS

PDF

67.7 KB Created: 2021-09-28 14:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68b5f88445f7a6065273b9627502e83d SHA-1: 15d62704cce88a2f83aeb60d6deb0d1224b2bd6d SHA-256: f9517ad4da13e1aaba178920cf5c1026d0a68c46f81faded1ac5c980e91b9170
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a likely attempt to direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and embedded URLs point towards a common phishing or malware delivery technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 5

  • 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.
  • 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 http://runhouchem.com/upload/files/30386732704.pdf
    • https://skvely-kup.cz/files/file/49954872058.pdf
    • http://allefrgycg.news-read.com/upload/files/71718636214.pdf
    • https://powerliteaac.com/userfiles/file/bumukaxusitijejurulobon.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/juvalarokogosikafofilabup.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/xexirerevifetuvabozuso.pdf
    • http://weifong.tw/fckimages/file/powulimudov.pdf
    • https://thucphamtruongxanh.com/Upload/files/99004909174.pdf
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/fitokibejejimef.pdf
    • http://ratchadatitan.com/UserFiles/File/94396005459.pdf
    • http://avandcie-automation.com/ckfinder/userfiles/files/bukisinajotaputaxexe.pdf
    • https://dawnraytech.985.tw/data/file/userfiles/files/mejeramunevupazibim.pdf
    • http://gayaarchi.com/userfiles/file/20210918075310.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/lariluzatovuxewexu.pdf
    • http://atomleasing.ru/media/File/xisudutotixidex.pdf
    • https://33mobility.net/uploads/files/70806809491.pdf
    • http://miet-boot.ch/images/uploadedimages/file/midudumopelunarugowinamu.pdf
    • https://bunexim.dascalita.ro/app/webroot/files/userfiles/files/73023866132.pdf
    • https://skywaynepal.com/userfiles/file/mavofipujofoxemu.pdf
    • http://clarksville.net/wysiwygfiles/file/nuferarowunofama.pdf
    • https://apsco.ly/userfiles/files/somanovajutimizinepamuwi.pdf
    • https://weeb.nu/userfiles/file/wevegogur.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/16299124937.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=911+proxy+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_off0000ad0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD0A 16792 bytes
font_01_sfnt_off0000c521.bin
36d1e9a7a3dbcc670622e6dd49c27fcbe81dff87bbfd2c7b22ff2006ef76a980		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC521 10280 bytes
font_02_sfnt_off0000dc5d.bin
0e06247d9ce4174bd96b894cf73f3af9208c09cc0cd72a8332b89146c30e9b8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 14736 bytes

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