Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8594aef39cef5f3…

MALICIOUS

PDF

85.8 KB Created: 2021-09-16 23:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b3ab144e82655e3777559bd7d890637 SHA-1: 95d23d7caa7c26dad65ab9b4cd772b44c11f814f SHA-256: c8594aef39cef5f3a371f8d25fa58a38ad63a2a8df55ce05742da184460c7f12
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to disposable domains and are used in a link farm configuration. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to download a password-protected archive, a common tactic to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=genshin+impact+hack+forum PDF link annotation
    • http://mixline.ru/img/lib/file/nuzeruxakeripibebiw.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/devepiwutasoxoruw.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/nexozibobufagozoxorokilu.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/82831950875.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/41515319889.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/40238279670.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907033123.pdfIn PDF document text
    • http://kco.su/userfiles/file/87499976135.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/80725747268.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/siziwefa.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/66057688788.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/xavavodosalekakawobur.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/duturosenekuxebiv.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/33039461157.pdfIn PDF document text
    • http://pi-consulting.ch/download/bevatisekoxomapa.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/79300011259.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/15560373359.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95bf50419---daluban.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/21064419125.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/1572253973.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/29152937621.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jatoxuxusawexisis.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/vomatim.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-9/20210909151805201208.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_off0000e57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57A 10932 bytes
SHA-256: b0cda3c4bdfb994c342fb1ea8b8e07cc085dedfe344b51a7180cab4bb559db1b
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 18900 bytes
SHA-256: f2388ee53dd023b83baf655d9ea58c94356483263d97dabc6fb7c4fe0849e71a

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