Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a4e343ad7e73d3…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 08:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1ea08b280895e19147f034ca10769c13 SHA-1: 64d381cfd57d4998c44b6f81370cadbfba7fe5a3 SHA-256: 86a4e343ad7e73d3c6f6846bc171cf7806ce7a31df47586c888cb2aef239e934
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of hosting many distinct links on disposable domains, a common tactic for distributing malicious content or conducting phishing campaigns. No scripts were extracted, but the overall structure suggests an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://garglob.ru/uplcv?utm_term=bioecological+theory+examples PDF link annotation
    • http://kingtonkatsu.com/uploads/files/98656894844.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/21823773115.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/96857231202.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613395fa2b8ca---nudomemunifuwujute.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/wulobebagurefol.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/juvoduxefateziguxivetazo.pdfIn PDF document text
    • https://mkart.it/uploads/file/41659393008.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/gelivepidaniduju.pdfIn PDF document text
    • http://xsjprinter.com/d/files/sesefarajopefixitujusim.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/kopabo.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/61622523521.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/64078139477.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/robosuwozi.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4527487255.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/26546517074.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/fofebalofutol.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/27518435425.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/62690258081.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/cac4cc6aeaa5c0836c83dc303cefe69c/nisinozokek.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/lifejotivuwenex.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/71353955346.pdfIn PDF document text
    • http://budka39.ru/files/kanoderavefevenegafip.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 16536 bytes
SHA-256: 7ceea6b2e480fb977edd4368982163f74d82bb23b25fa0ddc51902ebcf6acce6
font_01_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10988 bytes
SHA-256: aab85603093b0e18767e4197dc1f53835e04b5eb53e2b2c69f8c0b51bdf9ea87
font_02_sfnt_off00011d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.