Malicious PDF — malware analysis report

Static analysis result for SHA-256 088673bc6228c23e…

MALICIOUS

PDF

73.1 KB Created: 2021-03-18 17:24:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b37f6a976277a9665723d8b6a26bc739 SHA-1: 8eb0844d76186342f82e5f9d34a764a21f13da83 SHA-256: 088673bc6228c23e893d4edc41f91d9ecc3801580bbe62f53ee45e1bb2589ea7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to various domains, many of which are disposable. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure itself is being used to host and redirect to numerous URLs, suggesting an attempt to distribute malicious content or phish users.

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://dugedepap.ru/award?keyword=bell+palsy+treatment+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/sozimelizak/KKhhijJ/northwest_texas_umc_conference.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/CEggw5t/assassin_corp_mod_apk_2020.pdfIn PDF document text
    • https://sanevofodi.weebly.com/uploads/1/3/0/9/130969150/nelam-lifutisogiwudel-mixibe-nisej.pdfIn PDF document text
    • http://valaporinepisu.22web.org/60024439141.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/dedb818d.pdfIn PDF document text
    • https://cdn.sqhk.co/dipujabuxiw/i78Qbhc/at_t_thanks_hbo_max.pdfIn PDF document text
    • https://cdn.sqhk.co/tozakexidupe/iZQ3Qji/zexadasej.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/basic_computer_course_syllabus_for_iti.pdfIn PDF document text
    • https://vawosikajoj.weebly.com/uploads/1/3/1/4/131438279/aca1a4c48.pdfIn PDF document text
    • http://ontrade.top/android_10_and_android_9_differenceu2wkt.pdfIn PDF document text
    • https://cdn.sqhk.co/xubupigegi/icEjcie/sea_battles_of_napoleonic_wars.pdfIn PDF document text
    • https://keminozabigorez.weebly.com/uploads/1/3/4/8/134886120/mevijasogitasivukaz.pdfIn PDF document text
    • https://pakujefaf.weebly.com/uploads/1/3/0/7/130740244/5abf7.pdfIn PDF document text
    • http://pepariravifaza.getenjoyment.net/ragetoza.pdfIn PDF document text
    • https://nibapexi.weebly.com/uploads/1/3/0/9/130969889/kevolupifime_jijorelusekeli_xelisakuzefexug.pdfIn PDF document text
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/vewavajuvimuve.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/how_to_remove_kenmore_coldspot_filter9rpw5.pdfIn PDF document text
    • http://vizezokope.iblogger.org/calendario_milan_2020_19.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tirisesu.onlinewebshop.net/where_to_buy_sole_e25_elliptical_in_canada.pdfIn PDF document text
    • http://pudolajuji.atwebpages.com/basic_spoken_english_course.pdfIn PDF document text
    • http://rogofijanititad.epizy.com/advanced_materials.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_off0000e009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE009 5520 bytes
SHA-256: 4514d3961a4a04bcf6651a18fd536ac131594195ff24c8366cf3796cf7bef1fc
font_01_sfnt_off0000f2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C7 10536 bytes
SHA-256: e9a4426daf11670e58db909793c1cac44bdd632905f27c177375e8e536c80868

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