Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa358796b20d966…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 08:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 875c7d98d0ca053da4d1540367c6140b SHA-1: d6c05158ee6c5a0bda63dc68460e350c293a2bcb SHA-256: 1aa358796b20d96643441a1a1bf645670b16af735d3fcd20078caede7c3cb3c5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of numerous external URIs, including one with a 'free crack apk' UTM term, strongly suggests a phishing or malware distribution lure. The PDF structure itself, combined with the embedded URLs, indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://oniceh.ru/uplcv?utm_term=free+crack+apk
    • https://mallncart.com/userfiles/files/kuwelomowawovadokutebinow.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/97105112855.pdf
    • http://canvangdientu.com/images/file/16204017781.pdf
    • https://artedelvalle.cl/gal/files/file/58900200536.pdf
    • https://confeccionesruiz.cl/UserFiles/File/60040704910.pdf
    • https://toananhmedical.com/uploads/files/60329127913.pdf
    • http://0851gay.org/userfiles/202109file/2021091404215770554.pdf
    • https://conexkarvan.com/cache/fck_files/file/97493805834.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71084114815.pdf
    • http://sigmabhp.pl/userfiles/file/87698359865.pdf
    • https://autoteam.in/ckfinder/userfiles/files/loluwizamojogeke.pdf
    • http://clingac.es/d/files/24667629227.pdf
    • https://fivetc.net/uploads/files/wubamugo.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/75891178199.pdf
    • http://ukrainski-rosyjski.pl/userfiles/file/88660265765.pdf
    • http://sobateracota.ro/mm/file/rufatomiduloxamufizu.pdf
    • https://romalasergroup.com/userfiles/files/68268710144.pdf
    • http://dsacare.com/admin/uploads/file/zomowumuk.pdf
    • http://katyababash.com/images/uploads/file/58134447592.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/83567010470.pdf
    • http://karpatskiles.ru/store/file/teremaxudoxezo.pdf
    • http://tomboy2.com/images/library/File/609417214.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lewagabekivigilof.pdf
    • http://allefrgycg.news-read.com/upload/files/48469331325.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://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_off0000af52.bin
73f134e3b68da125aec86d2ccdc1ba1f500c3f8807daca40dcc6fc9ac3bed252		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF52 16996 bytes
font_01_sfnt_off0000db1a.bin
1ed00ca0d6231c5f45d0455ebe551f232263af7af7d13fd620e3a3c2daa24f10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1A 9808 bytes
font_02_sfnt_off0000f0b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16792 bytes

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