Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac1cefde1e580199…

MALICIOUS

PDF

85.9 KB Created: 2021-04-03 10:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ea01010a6b21509ef9d06ea5f47d1f1f SHA-1: 930bd16556eb7bf60dc747b5e387738e619591c9 SHA-256: ac1cefde1e5801991ab2c30c9acaf07c478a2b81827f4090e98b6420a740102c
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 0.9990

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://zajinet.ru/123?utm_term=mymathlab+answer+key+2018+calculus PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419629/normal_604bb251b1d9f.pdfIn PDF document text
    • http://sanatoriy-izumrudny.ru/book_of_sithcx8pw.pdfIn PDF document text
    • http://hotel-engels.ru/tizixutorumubiduwixancl8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_602e2d598c86a.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/pawunesisutol.pdfIn PDF document text
    • https://medotufise.weebly.com/uploads/1/3/4/5/134512565/0c3904d692423c.pdfIn PDF document text
    • https://kopusitubo.weebly.com/uploads/1/3/4/6/134698796/dazizoga.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/aibdSsR/bunch_beautiful_flowers_images_free.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/wugakakiragisalupalar.pdfIn PDF document text
    • https://sixojidolox.weebly.com/uploads/1/3/0/8/130814042/porobo.pdfIn PDF document text
    • https://zebazowis.weebly.com/uploads/1/3/4/3/134310266/fasese.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/jfid6jf/stacker_arcade_game_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482880/normal_604d78c5295b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454968/normal_601dd1d7b1bb6.pdfIn PDF document text
    • http://copyrightprivacy.site/mud_bogs_in_florida_20208n1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476768/normal_60649226c3fe6.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/u5YgeuP/pimuduvasofevofuwudokiga.pdfIn PDF document text
    • https://cdn.sqhk.co/doxowite/Deqibge/clash_royale_card_list_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwegamuvev/jihjbGz/personal_safety_action_plan_template.pdfIn PDF document text
    • http://rankingcoach-seo.com/game_rpg_android_terbaik_onlineszbwj.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/Mcjb8Op/22344261664.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/bjgZgjC/zepemi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/KPhghbn/34262208607.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://rikuworubit.myartsonline.com/bpsc_nursing_result_2020_download.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_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 5688 bytes
SHA-256: 23facc43d934a411aa87d9daf6e7a2a5b1a0e7b506612088ce174546620df2d8
font_01_sfnt_off00011509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11509 11676 bytes
SHA-256: a40e6a18f217e6ce05020be85aeae266e5cc9bae858d16edf60c1e42f0a588ae
font_02_sfnt_off00013bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BED 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f