Malicious PDF — malware analysis report

Static analysis result for SHA-256 0520fa690a76751e…

MALICIOUS

PDF

68.7 KB Created: 2021-03-11 08:06:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: bd81a146df961cb06475bba7c573d1a0 SHA-1: 326d0d5584f95c9dc511bbf9e18d0056406ec254 SHA-256: 0520fa690a76751ebb0ad179765360a8aabefe0935e50c7aed2ca09c59221c4b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=absolute+value+equations+worksheet+6th+grade PDF link annotation
    • http://xalenupom.getenjoyment.net/xepuximekumajir.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/who_invented_the_filament_light_bulb.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/bakC2hj/chris_brown_party_music.pdfIn PDF document text
    • https://cdn.sqhk.co/zefafulolit/gdigOl3/eon_player_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/lafuwexale/hhAtp8Z/hymn_of_praise_lyrics_william_mcdowell.pdfIn PDF document text
    • http://lovupijuti.getenjoyment.net/el_camino_del_guerrero_buff_academy.pdfIn PDF document text
    • https://cdn.sqhk.co/zanewijepex/jfmrha5/gezunetutujeru.pdfIn PDF document text
    • https://cdn.sqhk.co/xojelumegasi/v2Djcid/josenuxubojikekijiwaz.pdfIn PDF document text
    • http://fosireditoj.mygamesonline.org/high_alumina_cement.pdfIn PDF document text
    • https://kikebepuziji.weebly.com/uploads/1/3/0/7/130775256/414124202b5e.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/Btjdwhf/capsicum_pepper_spray.pdfIn PDF document text
    • https://gilaxisob.weebly.com/uploads/1/3/1/4/131406303/newame.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/DhbFxrS/wooden_sofa_set_designs_with_measurements.pdfIn PDF document text
    • https://fudanologakobur.weebly.com/uploads/1/3/5/3/135394175/puvodekama.pdfIn PDF document text
    • https://kukibutojiw.weebly.com/uploads/1/3/0/7/130775835/wutopabu.pdfIn PDF document text
    • https://sekonumewazu.weebly.com/uploads/1/3/4/1/134131339/df1a5ed5090f.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/top_10_items_for_wilderness_survival.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/UFgerzF/katun_bangla_2018_video_mp4lof.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/vuxagixil/large_screen_tv_size_guide.pdfIn PDF document text
    • http://zitadufafasid.onlinewebshop.net/xomeje.pdfIn PDF document text
    • http://tulajadulixo.myartsonline.com/tuzazemosonivejumumuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/libro_geografia_cuarto_grado_pagina_128.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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 5712 bytes
SHA-256: d9734cc17a261e33ee36821631e36aff8865b117a048af1bc9db4023bf94966a
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10300 bytes
SHA-256: 07d180d8c1cd90acad64d4846d94d020d5c502ddbdfb209ef1425a7b80cf26cc

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