Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ab06c4bfb8efe3…

MALICIOUS

PDF

107.1 KB Created: 2021-04-22 09:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 281b5ff406ec12637f3a7b769bba7d32 SHA-1: 08251795b58a8d97ee0f261e70b31b1374b6e5c0 SHA-256: d1ab06c4bfb8efe341790fbd96f72dff08f54e746722b2bb20499c197825e248
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with several pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://jacksth.ru/strik?utm_term=how+much+are+corgi+toy+cars+worth PDF link annotation
    • http://geleostone.online/g_shock_mudman_military_blackw40zf.pdfIn PDF document text
    • http://bekokax.getenjoyment.net/16335560725.pdfIn PDF document text
    • http://yewes.space/94601560600k3zhl.pdfIn PDF document text
    • http://nizumewuminal.iblogger.org/napepisadofu.pdfIn PDF document text
    • http://vehicleusains.com/87028106978i2ltu.pdfIn PDF document text
    • http://gatorama.site/77051101405bvta6.pdfIn PDF document text
    • http://mybiol.site/2747210747oc50d.pdfIn PDF document text
    • http://bojelopiroxi.22web.org/boyle_s_law_and_charles_law.pdfIn PDF document text
    • http://rte-ita.fun/saponamirixomakelugegizo1yq8p.pdfIn PDF document text
    • http://talkme-news.info/matematicas_discretas_y_combinatoria_grimaldicyqoe.pdfIn PDF document text
    • http://sputnews.com/rejizadekuzaxijunenokid0inqm.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/10332506549.pdfIn PDF document text
    • http://online-bestshop.xyz/becker_usmle_step_1_books_freew5eij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bunetexugefu.rf.gd/zibewajateligogev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad3d1bde-5616-4ab5-8c09-3cb29594cf3d/what_do_you_mean_by_margin_of_safety.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/is_metabank_a_prepaid_account.pdfIn PDF document text
    • http://zarabev.epizy.com/el_camino_del_artista_julia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a0d4852-73d1-4f69-a67a-2dfa5f1b632c/honda_eu2200i_recall_fix.pdfIn PDF document text
    • http://ravuxisopol.rf.gd/70139591077.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1a49c7-a3f7-40da-b50e-f0393bacf5b0/65700270148.pdfIn PDF document text
    • http://vitorozakosi.rf.gd/bragg_s_law_of_x_ray_diffraction.pdfIn PDF document text
    • http://nedofej.epizy.com/a_history_of_the_first_bulgarian_empire.pdfIn PDF document text
    • http://xisajegaxije.epizy.com/61013981518.pdfIn PDF document text
    • http://vafikozokus.rf.gd/ralibimuvijubago.pdfIn PDF document text
    • http://vuwonipaw.rf.gd/42780641783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24802d08-8f71-4d03-8a65-7b15c26b84cb/98330701311.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f7e872c-d8d9-4965-addb-9033c85031e5/hp_laserjet_3055_printer_cartridge.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/zoology_lab_manual_for_plus_two.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_off000164e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E5 5336 bytes
SHA-256: 6bf00ae3d68d477ea48a7fc976c64d22729bb868f18a2b008283b62ce3cb9429
font_01_sfnt_off000176f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F5 11372 bytes
SHA-256: 7083abbcf7b0723a4b37457f80c5a8e80d7a65f773232ccdd004edf00ee8fb39