Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a23ab5ed9af199a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-10 06:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b78f4d508a3bf1f642d6df254ec9438 SHA-1: 11ee832d9a6303a2bcd4aa686a332a1871a856c7 SHA-256: 3a23ab5ed9af199a9baa4b26ef40bd61e058e7e85ea424d146773bd52252d787
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm designed to redirect users. The primary attack pattern involves tricking users into clicking these links, likely leading to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://medvor.ru/uplcv?utm_term=top+10+pokemon+games+android PDF link annotation
    • http://raylutickenterprises.com/userfiles/files/siliti.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135e7eb4def3---gafowavigivojija.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/25729926213.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/gafamuxifatopowadulefodi.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/36533356706.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/78004180.pdfIn PDF document text
    • http://www.extramas.com/userfiles/files/19226359073.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/11213881970.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/tumibamu.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/82901170059.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/dopiposugagamusedufasito.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/lonufoxokenivafuluxiz.pdfIn PDF document text
    • https://worldpigment.com/image/upload/File/sajirag.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/madudaluritol.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/23924348570.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/67425193665.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/34300332446.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/wubeseliximutuw.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/vomegepikosojetoxewedegez.pdfIn PDF document text
    • https://impactmediaresources.com/userfiles/file/72525524997.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/pupedo.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_off0000c527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC527 10820 bytes
SHA-256: 45968a07ccb8651e7446b8f7f4bcb493cf8dedcf9a92e855ef1d704367747a73
font_01_sfnt_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 17668 bytes
SHA-256: d906471e5b8539ea11d536efc41ac8adecab97baf08128c9012a67c4131e8ec3
font_02_sfnt_off00010b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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