Malicious PDF — malware analysis report

Static analysis result for SHA-256 870ea87a4580b26e…

MALICIOUS

PDF

70.3 KB Created: 2021-03-22 23:40:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: de4363f65d0ff931e56a5a721285894f SHA-1: 22f42a925c5d9ed5766e47040764fa3cbca807a8 SHA-256: 870ea87a4580b26e71880b140e3e94d36d566cfc0ae92ecea06afa976dc1603c
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious PDF files. The document body, though heavily obfuscated, contains metadata suggesting it's a generated PDF, likely intended to disguise its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://vilenefex.ru/award?keyword=reliability+engineering+theory+and+practice+pdf+download PDF link annotation
    • https://demaxezobenila.weebly.com/uploads/1/3/1/8/131856353/kejidufavadixi.pdfIn PDF document text
    • http://limecash.xyz/krugman_wells_macroeconomics_5th_edition07q83.pdfIn PDF document text
    • http://fherixq.com/37832337981vbwxh.pdfIn PDF document text
    • http://revershjtb.site/is_upright_bike_a_good_workoutkhfax.pdfIn PDF document text
    • http://reliables.ru/82248329555dwkj5.pdfIn PDF document text
    • http://beliyden.xyz/download_enrich_your_ielts_vocabularybjps7.pdfIn PDF document text
    • http://malalij.iblogger.org/what_causes_a_dryer_to_keep_shutting_off.pdfIn PDF document text
    • http://opensalon.xyz/aoc_i2757fh_27quhpz.pdfIn PDF document text
    • https://kofeguku.weebly.com/uploads/1/3/4/5/134587943/62653d3.pdfIn PDF document text
    • http://instgrmmverifiedbadge.com/83271967926ahvyy.pdfIn PDF document text
    • http://peskomment.ru/597856562307gbb3.pdfIn PDF document text
    • http://cocobuka3.xyz/canon_mp160_printer_inkjrxfc.pdfIn PDF document text
    • http://funseeds.site/2805677412a8st0.pdfIn PDF document text
    • http://letxxnx.org/dewuzerenimofijaxorudezn3bbm.pdfIn PDF document text
    • http://shopbest.online/16599372395aywmw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kelawezup.rf.gd/catalyzing_wealth_for_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7f1c34-f815-481a-9a9b-da70d231ba5f/the_hound_of_the_baskervilles_1939_ok.ru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c59781-c067-4a12-a5f3-bbeced10e5a0/kezuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80af4a81-75d9-4ceb-8e3d-0708b02dde5f/handy_stitch_handheld_sewing_machine_youtube.pdfIn PDF document text
    • http://suvalon.rf.gd/speech_and_language_development_chart_asha.pdfIn PDF document text
    • http://nogigekeweragu.rf.gd/binibabedeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f647015-2661-41e4-8f9e-05d2e2b2c4f1/26517587339.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b048f1d-8b52-4091-a71c-33606e7c1f87/what_is_assertion_in_writing.pdfIn PDF document text
    • http://lewuxaxuzodu.rf.gd/tratamiento_fisioterapeutico_para_hernia_discal_cervical.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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 5580 bytes
SHA-256: 834c4fe0846f4b2cfac6ae6bde5dab06272f60fbc0ff976462b455ca42ca19cc
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 10276 bytes
SHA-256: cc9a7773b53de62c54f1ba120184d2af5fc7cfd10b3cdeb93eab20ddb736521f

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