Malicious PDF — malware analysis report

Static analysis result for SHA-256 381cb5ff6eb459d2…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 11:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cf75afb1a72ee204df008e7917ee24bf SHA-1: d0cbd82ac4447d21f2c339d4c654e157943c1119 SHA-256: 381cb5ff6eb459d27f2ebd2695890e10f118b201172ee82c6ce561b4df5c1abb
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.biogreeno.com/cms/ckfinder/userfiles/files/rowukulebe.pdf In PDF document text
    • http://hoshitorionline.com/uploads/files/70764606286.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/79579915366.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/sosewa.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/55430226579.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xikemade.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/78087161366.pdfIn PDF document text
    • https://aquaprosmart.com/userfiles/files/tuzigafixolonelarawobesap.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210912111031.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/ziwinivedisomejagaride.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/vinazozepipumabunexi.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/wepogoxopalogelega.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/gofopiwepagoreb.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/kesifelekojisikaker.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/54009395165.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/xeravugevadoxugalape.pdfIn PDF document text
    • http://www.yemany.com/yemfiles/files/44619381481.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/59376174852.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/xopapoboligepokazivedit.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/84403115636.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/demukitimabunowaxufe.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/64948749593.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/kepoxuwumi.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/tizomovoxosexebudewe.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/texagati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=oxidation+reduction+equations+worksheetPDF 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_off0000c01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01F 17008 bytes
SHA-256: c3ab5d15f2d10d48713420eb3160517a151f91490e1a3fb0102d0b87ec86cced
font_01_sfnt_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 10972 bytes
SHA-256: 56de97b3fbbd4a928ca0653fd0b0a71f54e534ae71569e994a4744e716910168
font_02_sfnt_off000105c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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