Malicious PDF — malware analysis report

Static analysis result for SHA-256 e36333b28cea142c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 21:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ebf464f1a28fcc78f29083759561190c SHA-1: 053c9040da30b2969b5f50f628dc1cd1533c2b30 SHA-256: e36333b28cea142c1d8b1f99c968c8666200f935c8f9fc7459293dcb6d848cd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The presence of external URIs and the link farm heuristic strongly indicate a phishing or SEO spam attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=is+sulfur+a+nonmetal PDF link annotation
    • http://aristosaigonhotel.com/uploads/files/kugibeduwizawuwopidoputab.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/vusizutamiw.pdfIn PDF document text
    • http://atrsara.ir/resource/files/dopatajapijugonezebo.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/61316858633.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/dexabowiwuzunijimu.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/89903281697.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fuwujifubagalakamegoneg.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/9079968960.pdfIn PDF document text
    • http://briztravel.com/upload/files/rabuvafavulomiko.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/nefabatujasovofo.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/38786970762.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/37134904874.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/59722564767.pdfIn PDF document text
    • http://columb-sklep.pl/userfiles/file/wefajonijugawaxi.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348b55d6940---mefawajugow.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/bijuporenisojaruma.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/rarenedizu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336e89d555f---wopawexasivefe.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/pudemutebubadugirijes.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/denufunoxewe.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/jutasuteninumiv.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/patabuzoti.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/43023751862.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 18968 bytes
SHA-256: 3355e8a677a78c041a3a5bade2f517e03d490830fde9d7622c4ae3e3e531a414
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13305 10336 bytes
SHA-256: 4a4d3d743a68cce1eb44229e0e735cb39e1e749094c1a6aae72d461dde7b73de

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