Malicious PDF — malware analysis report

Static analysis result for SHA-256 357f1808d00f2845…

MALICIOUS

PDF

95.2 KB Created: 2021-09-16 23:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef1b7256501b975aed10ea1705ecaa3a SHA-1: 1d701d3935058aa33c185886f7957d189147b1de SHA-256: 357f1808d00f284503664809cd6b2582feaf08bf26a4185fa0b2d27b9c8dc62d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms this behavior, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://thanuyentea.com/ckfinder/userfiles/files/68566298529.pdf In PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/50520319185.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/jukalulu.pdfIn PDF document text
    • https://krusomying.com/data/file/nisoko.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/55909028136.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/kizebew.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/jukafet.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/fazulubibi.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/retivibuwulevijovuxemi.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/be37521788f46732079639c16f818b16/risipekuliwelufaregawax.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f7745bbdb---91305676807.pdfIn PDF document text
    • https://dyaa.club/uploads/file/jonetupeza.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/zadilezirekelotowatepimu.pdfIn PDF document text
    • https://businesslife.com/content/file/didima.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/tezudezotitogepe.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/35288559172.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/78997467007.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/bubizotume.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pitukesatopexulog.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/67169709442.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xowasotu.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/40729037660.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/95553988534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=zefoy+instagram+followersPDF link annotation
    • 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_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001260d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260D 10720 bytes
SHA-256: c768fadf2781daf28f32d8001ae18e5a491d16be3d0942a96d9dff1f7502ceb7
font_02_sfnt_off00013ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC7 18932 bytes
SHA-256: 13ce0a8f8b911ef376af064fc7f64672f5173f175bfaac50c4be71fc24ef0b10

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