Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d31cb5bd62e630…

MALICIOUS

PDF

77.6 KB Created: 2021-03-04 13:43:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 8e08a363903ac13b3c5e919ba002cc21 SHA-1: 234963ed8320eed908ab03151cc91f2f9a8a8552 SHA-256: 26d31cb5bd62e630a7eee237bc3fa5a10ab3b38f055a41ef825a79f000f6af11
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The document body, though heavily obfuscated, contains a search term suggesting a lure. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded URLs. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://jacksth.ru/strik?utm_term=ducane+gas+furnace+ignitor PDF link annotation
    • http://chtotakoeverti.biz/my_ex_texted_me_back_now_what6a0i7.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/liislhd/atif_aslam_songs_2020_list.pdfIn PDF document text
    • http://organicsss.space/pekemonip4rrbj.pdfIn PDF document text
    • https://cdn.sqhk.co/jojojidatun/hjNpibN/jarefizerizubanixizafas.pdfIn PDF document text
    • https://cdn.sqhk.co/pigevikuwi/lYbhggh/cut_cake_into_8_pieces.pdfIn PDF document text
    • https://cdn.sqhk.co/wenisuvuroju/sgjVehd/mewe_gallery_company_limited_quilts.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/jjrZnjj/xenewejuguxuzuka.pdfIn PDF document text
    • http://fruit-ital.space/sikesubowawosakuzjh7dj.pdfIn PDF document text
    • https://cdn.sqhk.co/moradivovep/GRMwqhh/subway_ninja_runner_go_down.pdfIn PDF document text
    • http://walkover.me/linda_s_costanzo_physiology_downloadnmrxo.pdfIn PDF document text
    • https://cdn.sqhk.co/lokijuzim/2giijib/roku_secret_channel_codes_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/1bvhi8b/vawexixarozarodokif.pdfIn PDF document text
    • http://usejus.club/xomefeponi4nek5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3142453f-510d-4cd2-80f0-15b114f96a8a/sub_zero_wine_fridge_capacity.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac801a7-fddd-40fb-a955-3e897a3ee0b6/united_colors_of_benetton_shirts_online_india.pdfIn PDF document text
    • http://zopimejumujodeb.rf.gd/wejubupubexuvefukanuvid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3cae957e-2253-4e9f-bab7-e484e5931e13/shin_megami_tensei_nocturne_remaster_release_date.pdfIn PDF document text
    • http://wajalapivibobi.epizy.com/dj_awan_axello_terbaru_2018.pdfIn PDF document text
    • https://d8d691c7-cf48-432b-bece-a54604b57851.filesusr.com/ugd/1e3a4b_806fcd6bb19e42ad9db18f875e51a838.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_e513abaefa5d4e99b89837ed50c78114.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47bd436-327c-4bae-bb93-b47e9392c875/why_isnt_my_furnace_humidifier_working.pdfIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_4cc2c43cb56149f79c120b2786abfec7.pdf?index=trueIn PDF document text
    • http://pifajizimaguda.rf.gd/how_do_i_find_a_missing_persons_report.pdfIn PDF document text
    • https://f87ce62f-3d5d-4c42-bff3-2e7d00444551.filesusr.com/ugd/72ed28_1a96d4bc116547fcadc8ef891c996d93.pdf?index=trueIn PDF document text
    • http://lijazujarakowom.epizy.com/elder_abuse_mandated_reporting_illinois.pdfIn PDF document text
    • http://dovanokeji.epizy.com/game_escape_from_chernobyl_apk_data.pdfIn PDF document text
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_1b981fe6075f4528a5cfb1d1ec07d558.pdf?index=trueIn 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_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 5016 bytes
SHA-256: f939326958eb3d89f5c393703fb48c8b25e005fa4b7589d3f8fa953db2d92016
font_01_sfnt_off0001054d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054D 10388 bytes
SHA-256: 5e826bcfd89989f318a51bfe365c1058385721ac8214a156edd50839617354de

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