Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aff20efb505550e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-09 08:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 48787187e7bb99ae2454fb9754d03f3e SHA-1: 5aa7b5d6b324040982c8febd5beeb7fae2371c1a SHA-256: 1aff20efb505550ecfa20938338990feeb7bbe57119c1056448e5d4fdef63eaf
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=american+horror+story+coven+full+episodes PDF link annotation
    • http://hoangduy.vn/vn/files/wikatorowixapatorev.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/pizebe.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/42653403453.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/84671099400.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/bijifagesofibavebukono.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/46083096835.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/bitivubeburiwof.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/kalawewidajod.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/74389723740.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/97031979889.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/litisoguliwuperusol.pdfIn PDF document text
    • http://ecole.ru/text/images/file/79254221831.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/sofofuzux.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/14385603626.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/7113077456.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/49235962969.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/vusekefubudedoba.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/mawugawigutu.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/927303403.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/42515915055.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/vavaxelovinebukijiji.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/rozajavefozivoke.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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 11144 bytes
SHA-256: 4c331679a1bc9c955fba40586eb6d0077417902bc9fe0e39f0dd09ba3b37f487
font_01_sfnt_off0000f2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0A 17660 bytes
SHA-256: b898375feff72131687eec14afaa8282b7c93186a55dd61b3cf44bc40dec6131

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