Malicious PDF — malware analysis report

Static analysis result for SHA-256 758d86c3daca6f52…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 06:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: aa5cca0a0d6d5ff2a610f0852eeced9b SHA-1: 1ece5aed6c092f79cfe3b6595ed94366319f32ae SHA-256: 758d86c3daca6f52cc4e799264c1afa4c100eeb994461bc8546e6b5d16066c96
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 0.9965

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://smidgel.ru/uplcv?utm_term=khmer+song+apk PDF link annotation
    • http://dpsszczytno.pl/photo/file/39181197287.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109051422576006.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/17161397857.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/8389556151.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/63000411603.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/jukujisumojig.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/80970991123.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/86018373677.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/jiwukilamanulojuwe.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/kufuwunexil.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/86076840321.pdfIn PDF document text
    • http://www.xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/gexararipifibufaromajag.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109080658244906.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/27257180915.pdfIn PDF document text
    • https://begili.com/uploads/image/files/gozimiwu.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908120900.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/98784687685.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/87938772610.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/16819926991.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/68713490364.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/30197141836.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/lukanuwijoxinoji.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_off0000b7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB7 10548 bytes
SHA-256: e1dfd9acf5a534559df8bdafe2b323e83d4f90f274068d5dcd401328973f5b99
font_02_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 17804 bytes
SHA-256: 7e623ca20b3a4cb00229c8533c4ae8471ee57e3ae4167c746777dabe8880d194

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