Malicious PDF — malware analysis report

Static analysis result for SHA-256 e320fac13ca6a024…

MALICIOUS

PDF

78.6 KB Created: 2021-04-23 13:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8c8299fb79681bed60294794ac9e6714 SHA-1: f1bbcadae347f77a9800c93b50deb4a9506c4ac2 SHA-256: e320fac13ca6a024c3f6fe170c492f96f63e89faffc0785ad009b1f6a8347fd6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicative of a link farm or SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=scary+stories+to+tell+in+the+dark+tamil+dubbed+free+download PDF link annotation
    • https://cdn.sqhk.co/tavanaru/g7geCth/jewuwilivix.pdfIn PDF document text
    • https://cdn.sqhk.co/bisidilit/ijdkvgo/openttd_new_graphics_download.pdfIn PDF document text
    • http://sosunimepewe.22web.org/conjunctions_worksheet_8th_grade.pdfIn PDF document text
    • http://sodabisunuk.22web.org/water_pollution_project_in_marathi_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/jejcjcV/31441762928.pdfIn PDF document text
    • https://cdn.sqhk.co/dasotipamu/1jFLgjg/26069001635.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/dHhfWjj/jijiganusetebisu.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/b3icBXs/limidix.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/WrKYgd1/95831421414.pdfIn PDF document text
    • https://baludofagufa.weebly.com/uploads/1/3/4/0/134096440/vanamarixam_dogajivuvizok_zowis_weradov.pdfIn PDF document text
    • https://cdn.sqhk.co/guvawatuzax/gdjhfG0/71005703502.pdfIn PDF document text
    • https://kijenelix.weebly.com/uploads/1/3/4/6/134612576/8511116.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/pujinit/donjon_5e_spell_sheet.pdfIn PDF document text
    • http://sunotewisutexo.epizy.com/87934474224.pdfIn PDF document text
    • http://suzusufiwavel.rf.gd/gulafujixanobelapi.pdfIn PDF document text
    • http://jugebifa.epizy.com/woxudifezibitugigabu.pdfIn PDF document text
    • http://gelanuvefod.epizy.com/66454411851.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/durapodudunetena.pdfIn PDF document text
    • http://luwanidali.rf.gd/givabejinonudupetinut.pdfIn PDF document text
    • http://gerikopowabog.epizy.com/16307656091.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/sonic_menu_half_price_after_8.pdfIn PDF document text
    • http://nugugirufomas.rf.gd/les_animaux_fantastiques_les_crimes_de_grindelwald_livre_gratuit.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 5760 bytes
SHA-256: d47bd24df0f577c9683493780fc7a711112b44496f4a989c000fd301a388acac
font_01_sfnt_off000104ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AB 11592 bytes
SHA-256: 6a1f6e6c8a676b0158e56889eca0847e69d2fa944d8aa633f67fad5cbdf7dbac

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