Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f94b4a04fa34bf…

MALICIOUS

PDF

71.2 KB Created: 2021-09-11 13:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ef6d4f53a6256a8aaac64b32845e6be SHA-1: f63a94fc5e4afb68be9cea2c2e4578151e303ba7 SHA-256: 80f94b4a04fa34bf5de7615b23d216f7c723bbfc27bdc0ed308a915480744878
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to unknown PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c02e8f256c3f4213a558abf5ccac1518/vodagasasazep.pdf In PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/vazanikojogufogapeva.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/vofaxosijunusuwage.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/bc64aa9101ff0a01122adc677b302184/32221465433.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/kananidowafukokojonu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/09195349916.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/wajuge.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///kefojixixokuk.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/27780046380.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/39118774605.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/88703960596.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/38617100110.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/69440722487.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/lirafu.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/37590322009.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/91511666401.pdfIn PDF document text
    • http://hrudolf.com/userfiles/febew.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/14178358923.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/gegudebivo.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/fisibutulapame.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/6339560199.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=introduction+to+quantum+mechanics+griffiths+3rd+edition+pdfPDF 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_off0000b5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE10 11388 bytes
SHA-256: e724861f338fa9f1d09e9c47547a28dcd1a6b7e50571e4fe366b9945f0d7cf67
font_02_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 15344 bytes
SHA-256: 764d023a7cb20925f4bea877a134fff0fbfb9fb998b7ab9bd935e38a17d4cd5a

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