Malicious PDF — malware analysis report

Static analysis result for SHA-256 68597fc6fa263a52…

MALICIOUS

PDF

90.2 KB Created: 2021-09-14 01:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1d4d26f9d9b138960d314469d60d8301 SHA-1: aabcea4841b1b836c0b23499602c4bd2d5503851 SHA-256: 68597fc6fa263a526ae76f0d377a830b75b8b10fecfd1bf122dde272dc1344fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous distinct hosts and URLs. The embedded URLs likely serve as lures for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://allytemp.ru/uplcv?utm_term=encouraging+words+starting+with+s PDF link annotation
    • http://oodow.cn/upload/file/210908013540076777nb2t6fslvyxw.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/wexamisimomofer.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/pefesibizotumozuxiz.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/22420080375.pdfIn PDF document text
    • http://baove247.org/upload/files/29853638885.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/50655882265.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/33548813745.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/jajun.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/95846825217.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/1ca2e8.pdfIn PDF document text
    • https://proia.bg/userfiles/file/22187947208.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/31680100280.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/rovus.pdfIn PDF document text
    • http://juncheng.tw/upload/files/4942664675.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/14914116563.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613310669f969---zivipojeg.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/kotasebusajarelugo.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/dalaxanarugubafegepomim.pdfIn PDF document text
    • https://www.padanguparduotuve.lt/ckfinder/userfiles/files/kokokizapubobukuvem.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/61252383346.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/lawofizadozadiri.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/sufegudesemomitagapa.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/47224027146.pdfIn PDF document text
    • http://foodexgida.com/uploads/files/jutakoger.pdfIn PDF document text
    • https://equalland.com/uploads/File/pomobilos.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_off0000fe8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8D 10640 bytes
SHA-256: 3d37e3e6cc374dd63146bd3891c79de1c30e01cf590e2494b6f924f39068ae23
font_01_sfnt_off000116b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECB 17272 bytes
SHA-256: d1ab9ec46f50734b4b8f29625d51e5cf311fdaf6e9be841116dbd4dc489455ca

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