Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f71f9194316d59d…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 21:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5aadf727b473967499f0ba9ecdd8c27c SHA-1: 1ca55baf6ee179e11c3de0b7d01bc27861da6f9e SHA-256: 8f71f9194316d59d6b850c6d5845c7cd932b65bf488b549b1c7ab0bab2c369b4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://medvor.ru/uplcv?utm_term=dark+play+1.1+apk PDF link annotation
    • http://another-partner.morefriendship.com/upload/files/19776248043.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/togefutorikiwajavaj.pdfIn PDF document text
    • https://digicpictures.com/downloads/74452795263.pdfIn PDF document text
    • https://camelcarpet.org/d/files/87774735465.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nakemadusul.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/nimeribotagixed.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/3839425314.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a5b6dc7eff9de903521c632480e9ea06/leribubov.pdfIn PDF document text
    • http://devveb.net/userfiles/file/29042967736.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/lolekeneven.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/redixozatekavep.pdfIn PDF document text
    • https://el-tall.pl/pics/file/23019043426.pdfIn PDF document text
    • http://fittbikese.hu/files/file/guxedidaloxoxejafetuke.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/85403490147.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/88818200884.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/folozipewizegib.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/bogidifoxaxopog.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21894418292.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/masovotatisabemoveki.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/xifoxelafakagetabapilu.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/33497415484.pdfIn PDF document text
    • https://halkum.rs/files/88768979944.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/likipesus.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_off0000c0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D8 9856 bytes
SHA-256: d393e634ef6cee157d3a2ed095a7eaf0b4d6005a7304d2dcc4b413b8727aac70
font_01_sfnt_off0000d6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A6 17932 bytes
SHA-256: 7183e3313eb1699905402ee828c0ee5460061dfade084e49e25c62759fe1a697
font_02_sfnt_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1