Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a4660f1b85561b8…

MALICIOUS

PDF

83.8 KB Created: 2021-03-20 15:12:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 45d3dd4bc758ededd5b63698885ac75f SHA-1: 008d908d478b938777ff76f2614f147ae653e757 SHA-256: 3a4660f1b85561b82dba72faa6c2f059426f6056f6e3c4227c52774b6032c8e1
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or engage in SEO abuse. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful sites.

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://xezojetit.ru/strik?utm_term=ejercicios+verbos+irregulares+ingles+pdf+1+eso PDF link annotation
    • http://vuwimoxit.mygamesonline.org/what_was_going_on_in_germany_in_1912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449998/normal_6026fe127db53.pdfIn PDF document text
    • https://fufukarebalomok.weebly.com/uploads/1/3/4/3/134352968/5557463.pdfIn PDF document text
    • https://vunukufe.weebly.com/uploads/1/3/4/6/134640969/muvesosutaj.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/lupisasugibaw-visotinedu-gisopi.pdfIn PDF document text
    • https://jikodidujur.weebly.com/uploads/1/3/5/3/135319234/4445550.pdfIn PDF document text
    • https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/9009425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_60107edc2fdb3.pdfIn PDF document text
    • http://kufowawixapiva.sportsontheweb.net/fenasefore.pdfIn PDF document text
    • http://rokuboxajiga.medianewsonline.com/71060723487.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_600bde84b4abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477873/normal_60311e287be4c.pdfIn PDF document text
    • http://wodedutipif.medianewsonline.com/tree_of_life_movie_meaning_yahoo_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kikanelomer.onlinewebshop.net/29020176874.pdfIn PDF document text
    • http://gototura.myartsonline.com/apresentao_de_proposta_comercial.pdfIn PDF document text
    • http://luvetux.myartsonline.com/biopsychology_by_pinel.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/annona_glabra.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34D 5408 bytes
SHA-256: 12c5b7c38d60f439294a479e71bfac537958063ab8c0810e58940811edd0026c
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 12716 bytes
SHA-256: 0f37286c8bafe9fccc328767e605c67703639e0b33bf80622a6d1fa5fc39b418
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00013383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13383 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378