Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7d6b56549a3306…

MALICIOUS

PDF

75.5 KB Created: 2021-03-09 10:18:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 454945dbe8623bbc77aa407555b6008a SHA-1: 6f8d12f1ddeb5d58e7359eb81cd7e4e05dde8896 SHA-256: 5a7d6b56549a3306822ee1577d9e3d7122f39c9f6316494516dcbe81e84d1360
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by a large number of external links, many pointing to disposable hosting services. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=oster+blender+pro+1200+with+glass+jar+24-ounce+smoothie+cup PDF link annotation
    • https://cdn.sqhk.co/goganededem/idhjgdB/free_online_3d_carrom_board_games.pdfIn PDF document text
    • https://jupimoxojufe.weebly.com/uploads/1/3/4/8/134860775/94a2b45651af27.pdfIn PDF document text
    • https://lodipopigib.weebly.com/uploads/1/3/1/8/131857338/6246825.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/fivuporonezonalake.pdfIn PDF document text
    • http://jowopejev.22web.org/wupifaluzijetupaged.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/bsc_nursing_syllabus_rajiv_gandhi_university.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/dgg4xxa/funny_guy_names_that_start_with_the_j.pdfIn PDF document text
    • https://cdn.sqhk.co/sixatowitur/Hidjbjb/beauty_video_music_video_editor_slideshow_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/jjecxga/75367275496.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/jieQghW/51470536503.pdfIn PDF document text
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/6e7ea.pdfIn PDF document text
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/ffff9d3614b5.pdfIn PDF document text
    • https://sadewirezetif.weebly.com/uploads/1/3/4/3/134318623/abd58e013.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/how_to_access_bios_on_acer_aspire_laptop.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/candy_crush_game_pc_uptodown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejajubuwuwo.rf.gd/job_interview_questions_and_answers_for_waiter.pdfIn PDF document text
    • http://dejomogilum.rf.gd/bagrrys_company_information.pdfIn PDF document text
    • http://xefobimulekojuw.epizy.com/mumaboki.pdfIn PDF document text
    • http://dokubuxopid.rf.gd/afro_house_sample_packs_free.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_off0000e6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F5 6268 bytes
SHA-256: 559096ac4162610049cdefbd4a9974acc54cae64cdb5dac51cacb8b27ba584e6
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 10692 bytes
SHA-256: dbacbdbddbfa27ad09be67b131a717cffd1ebf4b1f1876561c2c7b4a0c7229ea

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