Malicious PDF — malware analysis report

Static analysis result for SHA-256 1007ecdd4f67fad6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-24 17:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0fd5910b3a20f739b515216b479783d1 SHA-1: 615fc776570f5c47e6e77f2cbcc5d41cfd4696dd SHA-256: 1007ecdd4f67fad6804b1b16d20aba6ed2e98851a7f76f770ce745341c9f1847
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a deliberate attempt to obscure the true destination or spread malicious links across many domains. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://synerhu.ru/uplcv?utm_term=pokemon+gold+master+ball+cheat PDF link annotation
    • https://mvpartners.be/images/uploadedimages/file/kudajaremapavenufosiz.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021091701293116.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/9788915909.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/68727217430.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/boxufutumesosaji.pdfIn PDF document text
    • https://kenadong.com/contents/files/zazevedisasigekovijobevo.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tapuvajagugufori.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/37474046181.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/29026732777.pdfIn PDF document text
    • http://screen.by/images/file/lejeruzosaz.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/97232808186.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/74798970690.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/30510867156.pdfIn PDF document text
    • http://schokofontaenen.de/idata/34439367219.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/186e7db04af2e90f6d67b45f2cde1cab/10362863627.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5179_20210909031614.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/mawevemitugawo.pdfIn PDF document text
    • https://ysh.my/userfiles/file/ronukizojiwideregijom.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/vekixoto.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/noborunuwe.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/37659498380.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/gajefonepejorogaseso.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fb121ddea0af568f2b71ce6d02048526/vumomaliwufakiwilabos.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/84239568793.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/vupudi.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_off0000b433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB433 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC45 16268 bytes
SHA-256: b4ed72867d4ca4257e4b4ca4def80f625d7249038005775e2b2e441450ecf2cc
font_02_sfnt_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 10960 bytes
SHA-256: 9eea0e909e10c3ad64f98820bd53c5ee44a26bfdd5d7cfe938b9217ea6f17157