Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b2c93f83f720bec…

MALICIOUS

PDF

93.7 KB Created: 2021-03-18 12:28:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a8b570fc21ea5ea082ffdbf228111da7 SHA-1: 1e6e1cfa56ceec4d91e93efce46240a0ef41480e SHA-256: 0b2c93f83f720bec580fbf2d3f49f6dab24c2ae07d07cdfd7be2aeb0072d7395
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://seumenha.ru/123?utm_term=business+plan+powerpoint+pdf PDF link annotation
    • https://xipejefokodidub.weebly.com/uploads/1/3/4/6/134612454/52c61148eb4eee5.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/tukafog.pdfIn PDF document text
    • http://4gusevshop.website/inter_tottenham_tv_guidex5c6v.pdfIn PDF document text
    • http://runolive.com/ffxiv_reverse_engineering_fate54jcw.pdfIn PDF document text
    • http://zizodoroluxonaf.sportsontheweb.net/54556993541.pdfIn PDF document text
    • https://dadizatutelebi.weebly.com/uploads/1/3/1/0/131070904/rewilutotelaz_mazopak.pdfIn PDF document text
    • https://mofumamivuzav.weebly.com/uploads/1/3/1/0/131070192/8223226.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/vi_append_to_end_of_multiple_linesntp9s.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/luzuxijinafuzufakemo.pdfIn PDF document text
    • https://dofopukirisozut.weebly.com/uploads/1/3/1/4/131437491/kadufevasorunix-minodomugiko.pdfIn PDF document text
    • http://goodsun.space/what_is_newtons_third_law_sometimes_calledyya6j.pdfIn PDF document text
    • http://fefiwizam.sportsontheweb.net/human_resource_management_calicut_university.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
    • https://s3.amazonaws.com/jutenojamega/literary_analysis_conclusion_template.pdfIn PDF document text
    • http://visobiwedixupip.rf.gd/81834203144.pdfIn PDF document text
    • https://b5526579-b22d-45a0-8251-9885a72cf3eb.filesusr.com/ugd/0cd019_57c527f555ae4851be8a4bc1c350eb99.pdf?index=trueIn PDF document text
    • http://zizumanoxiv.epizy.com/first_alert_9120b_green_light_flashing.pdfIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_5446a6bbc59a42469f35f46babdadc08.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/badnaam_club_remix_song.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/82122393331.pdfIn PDF document text
    • http://zivexotafoni.myartsonline.com/lactogenesis_en_vacas.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/amritsar_golden_temple_wallpaper.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 5056 bytes
SHA-256: 9609077c8c44d030379ba2166e56ce30a40b58205fea4bda6174708151894220
font_01_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 11024 bytes
SHA-256: ef7115ba80c547af6588ad0c53fcc4ecc55e657a2cef34fdbc63ed9a6904b71b
font_02_sfnt_off00015b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B86 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378