Malicious PDF — malware analysis report

Static analysis result for SHA-256 814fb301786e9818…

MALICIOUS

PDF

78.9 KB Created: 2021-02-12 23:27:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7fd743df2653e74a6f23abe4fe316c69 SHA-1: d2a70fbc2cffb0289c4699801bc35057a255c4f5 SHA-256: 814fb301786e9818f340fcf1506d7178e34f0c9dfeea87d08032b717a844fbdd
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains or using URL shorteners, characteristic of a link farm used for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=umn+law+school+ranking PDF link annotation
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/81613.pdfIn PDF document text
    • https://cdn.sqhk.co/buzodafevuj/5rOb6ig/4891441926.pdfIn PDF document text
    • https://pulimogub.weebly.com/uploads/1/3/4/3/134312020/6857694.pdfIn PDF document text
    • https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/68f997d6817.pdfIn PDF document text
    • http://euromarket.pro/soul_hunters_wiki9o9z2.pdfIn PDF document text
    • https://suzefajadovu.weebly.com/uploads/1/3/4/5/134592553/1ca2ad.pdfIn PDF document text
    • https://tezexitebab.weebly.com/uploads/1/3/4/6/134600353/nixukigoba.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/hifichd/jakirifixu.pdfIn PDF document text
    • https://zifimebitumane.weebly.com/uploads/1/3/4/2/134236425/fosuf-mimejegogamajo-tunuramokixurig-kokebigop.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/hegiSMw/zikeselunisa.pdfIn PDF document text
    • http://wevesapawuzu.22web.org/refeburefoliwe.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/CgfIggc/jekivusixazapopitef.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/jfNdKgi/clicker_heroes_hack_code_cool_math_games.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/cjdidje/write_5_sustainable_development_goals_of_undp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibogifimot.epizy.com/86119381722.pdfIn PDF document text
    • http://fajegexowesidet.rf.gd/76209412690.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/b._h._m_full_form.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_off0000f7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F9 5360 bytes
SHA-256: e4be89c52965cd87d1ff979f0b24a6e513c902a09c3493664fcc5ce9982fe706
font_01_sfnt_off00010a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1B 10644 bytes
SHA-256: c7b19a69e3ea1bca9dff2ffff528b19dc497fcd5e5ce7c65d6ff0ce01534ab04

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