Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3d58154e5f8f85…

MALICIOUS

PDF

94.9 KB Created: 2021-04-01 15:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af874764ab4cea8ac46d9900bf98abcc SHA-1: b0e52d5c3d3d7187d298c5ad44570dda94b8bc6c SHA-256: 0b3d58154e5f8f857ffd0f9bfe8c3bdc4e945a44adad152aa8648f15c7d95e5d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to car maintenance, suggesting a lure to trick users into visiting the malicious link. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://pelibifir.ru/strik?utm_term=how+to+turn+the+service+engine+light+off+renault+clio
    • https://static.s123-cdn-static.com/uploads/4385026/normal_5ff1d18a8afff.pdf
    • http://fanutoragozogow.sportsontheweb.net/terjemah_bidayatul_mujtahid_jilid_1.pdf
    • https://cdn-cms.f-static.net/uploads/4487658/normal_603ff998720a7.pdf
    • https://cdn.sqhk.co/pulobegefuzi/idhiU2m/70983157512.pdf
    • https://cdn.sqhk.co/baxijaxazixi/8BpB5AJ/epic_boss_fighter_2_best_build.pdf
    • http://puzososiv.22web.org/ccna_lab_guide_nixtrain.pdf
    • https://cdn-cms.f-static.net/uploads/4389104/normal_60254edb8b499.pdf
    • https://cdn.sqhk.co/filodomazora/hjdidD3/88168559753.pdf
    • https://cdn.sqhk.co/dabeluza/3gfggW3/rukawasuzokedorexesip.pdf
    • http://dukafufuxona.iblogger.org/kagorimigoludefakutewusot.pdf
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6043dada67381.pdf
    • https://static.s123-cdn-static.com/uploads/4449987/normal_5fdfbe7508342.pdf
    • https://cdn.sqhk.co/xasurila/igghgh0/5625405354.pdf
    • http://tudilaxug.22web.org/felalunifomog.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/ganubifirigevi/23987019285.pdf
    • https://uploads.strikinglycdn.com/files/42ca1a16-8da9-4739-938c-397fcdf70be5/51859590716.pdf
    • http://wilaroxu.atwebpages.com/best_highlighter_app_android.pdf
    • https://uploads.strikinglycdn.com/files/4582963f-3367-4da9-af9a-c956b279393f/94294448926.pdf
    • https://uploads.strikinglycdn.com/files/db64202c-a5bd-4d67-93ad-194b2a784e6e/dujoruditifa.pdf
    • http://litorow.myartsonline.com/riguxuwa.pdf
    • http://dixasimoxipux.rf.gd/google_sheets_query_combine_columns.pdf
    • http://lusajafimaneru.myartsonline.com/wodojijefanevetikij.pdf
    • https://s3.amazonaws.com/petuzutemixuvod/maths_worksheets_for_grade_4.pdf
    • https://s3.amazonaws.com/nuvukivaxiren/bit_heroes_familiars_fusion_guide.pdf
    • https://s3.amazonaws.com/fogibi/63029768114.pdf
    • https://uploads.strikinglycdn.com/files/f907073f-cc81-4b48-a547-e7330e7d7b48/jijesosozejokusibazoda.pdf
    • https://s3.amazonaws.com/jejulurowev/77932484700.pdf
    • https://uploads.strikinglycdn.com/files/02008334-6a0c-4dfc-94c2-23e057d3804a/rekotevugevejenalizuzib.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
    • 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_off00011db7.bin
38fbfde629a7fa876ab6ee4eda051452f63249966bb3aaa0b7adb91f699d60f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB7 5256 bytes
font_01_sfnt_off00012fb0.bin
87789117f672ccd2e0668fc4567c94c668c22bfe3764242ed9e1da57c872af9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 12068 bytes
font_02_sfnt_off00015822.bin
7851fffef52e473cda661ca30cfe3df526f3fed1248a67fb10825064e0e4480f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15822 16084 bytes

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