Malicious PDF — malware analysis report

Static analysis result for SHA-256 6849d34cb388cecf…

MALICIOUS

PDF

90.2 KB Created: 2021-09-19 13:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd587cd2311d132bcc2951590011c4fe SHA-1: b77077055a2eb78482c6fc051d48a3013a67282b SHA-256: 6849d34cb388cecf3bdba1dd3c23dc85f9d7cfe26746b13f464d72148f57d772
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains.

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 http://tischlerei-schlusche.de/sites/default/files/file/batogiwoj.pdf In PDF document text
    • https://imihwa.com/uploads/image/20210908/files/20210908081714.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/65648321004.pdfIn PDF document text
    • http://tianfonmm.com/d/files/jifozi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161421ae2d590b---14469210351.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/gutelemalujixagodonaj.pdfIn PDF document text
    • http://innotack.com/userfiles/files/xutomilekikugewilavawi.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/basuruzutik.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/16779848459.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210915/file/35590458437.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/9755950839.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/54973580059.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/sepopuzi.pdfIn PDF document text
    • http://nordicwalkingturak.hu/_user/file/41252279541.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sifomakuna.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/maxegifajanul.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136460ddf8ca---50564308727.pdfIn PDF document text
    • http://szm.hu/userfiles/file/6568154988.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/95350776154.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/dutamamezosiwapujiwaku.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lumegajatezaw.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/vomibajorilugeme.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/kopokidetefirikajusizupip.pdfIn PDF document text
    • http://baove24h.info/upload/files/tedetazadexobonegaxozuwet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=driving+skill+cheat+san+andreasPDF 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_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11504 10688 bytes
SHA-256: 1b4416c1cc03da63a6c0841387c4077112020104c43ec5d31cf768695358f35f
font_02_sfnt_off00012d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4B 17484 bytes
SHA-256: e446d2a44158ba12d2e68f33433f98f118cce8406f8f694cccbca2a505a31889