Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d2ae76fee6483…

MALICIOUS

PDF

80.4 KB Created: 2021-04-13 21:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d3356bbf3001dd7305bf86d9b5e0fd38 SHA-1: 31fb0df6d9c0481d5a278aaaf36d9dbd660dbf2f SHA-256: 924d2ae76fee6483e396018c08191188b6bbba4b70c6991f9414099003b398ff
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9993

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=walking+dead+volume+193 PDF link annotation
    • https://xuropowupenuba.weebly.com/uploads/1/3/0/8/130813979/2395653.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/uElhdji/heart_touching_love_stories_in_telugu_to_read.pdfIn PDF document text
    • https://tevirilozarenov.weebly.com/uploads/1/3/2/6/132695732/6499389.pdfIn PDF document text
    • https://xuvamifete.weebly.com/uploads/1/3/0/8/130874567/4589870.pdfIn PDF document text
    • https://gijagexerifaru.weebly.com/uploads/1/3/5/3/135322880/7576716.pdfIn PDF document text
    • https://cdn.sqhk.co/mivadunoxo/3pibNB6/33465929589.pdfIn PDF document text
    • https://cdn.sqhk.co/dibitarebizu/jsyJPme/fuloweligenak.pdfIn PDF document text
    • https://cdn.sqhk.co/totudavomud/giKgjc5/65562930216.pdfIn PDF document text
    • http://nijikelax.22web.org/xebuvubadenojukevo.pdfIn PDF document text
    • https://dekamukovesu.weebly.com/uploads/1/3/5/3/135324216/8095765.pdfIn PDF document text
    • https://cdn.sqhk.co/xejulonejo/gd9ogg7/orange_ball_dress_nz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sikuva/toward_an_anthropological_theory_of_value.pdfIn PDF document text
    • http://zegudonokor.epizy.com/zowedokisazikomivula.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_102fd9dd87484d278a874d8a11033046.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_e8f376394f9d4e4d9f5ba75c2555bd8a.pdf?index=trueIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_7e53b3c3cbb349cd884c68e7305e657b.pdf?index=trueIn PDF document text
    • https://61069a5e-3c5f-4884-a3c7-8c7552058b74.filesusr.com/ugd/0789d5_9bbc76597b7e4cc2ae56a3e6e81fc7eb.pdf?index=trueIn PDF document text
    • https://8c0e102b-efba-4641-b7fc-347c26357927.filesusr.com/ugd/d420ee_b6e2898cb78b47d49da17fb12b9a5ef5.pdf?index=trueIn PDF document text
    • https://e209d09f-5af8-48a0-acfc-72d03e9bea0d.filesusr.com/ugd/946fcc_52af09d239064ab9aa5bc59050d45e92.pdf?index=trueIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_e558739769bb4c8d8aae067c4048192b.pdf?index=trueIn PDF document text
    • http://fuxodenajakifut.epizy.com/34964564500.pdfIn PDF document text
    • https://s3.amazonaws.com/kaxukok/oxygen_therapy_guidelines_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/how_to_say_thank_you_god_in_different_languages.pdfIn PDF document text
    • https://ee897e78-a157-4eb5-8a47-d615096087a2.filesusr.com/ugd/113e89_341f129c65004a00819c33a703c2c534.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 5380 bytes
SHA-256: 8dd7088f5cef38a6b4b894c287d531cb451393669b6c2fed3b4fdab2e0440917
font_01_sfnt_off00010f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6B 10836 bytes
SHA-256: ffeefdacd0c3c0cf2db4e4a487693f1993790cc8aad14eb7dc6182c51dfb644c