Malicious PDF — malware analysis report

Static analysis result for SHA-256 918710b550998f7c…

MALICIOUS

PDF

84.7 KB Created: 2021-05-08 21:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ecb1210654a2df0cfec06791eeb8f7b0 SHA-1: f10143b6401355c9df6aa3c185c5d8ae49d6228a SHA-256: 918710b550998f7c560b270f11c552791fc2da353d80b0ae9ceda589e8a583f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely lead to further stages of the attack, such as credential harvesting or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=the+shadowhunter%2527s+codex+pdf+weebly PDF link annotation
    • http://superheatbelt.xyz/369842288833gluz.pdfIn PDF document text
    • http://hermidkovo.info/ruzobubonodamalagelekepubcaxth.pdfIn PDF document text
    • http://uscreditcheck.info/how_to_cook_a_rib_roast_on_a_weber_rotisserie2n1ya.pdfIn PDF document text
    • http://roman-holidays.shop/495317376775c7z3.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/aestheticism_in_english_literature.pdfIn PDF document text
    • http://phrensy.co/peak._getfueled_answer_key_biologysebrh.pdfIn PDF document text
    • http://help-service-support.com/72168062895czh3.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/sukixizokixofed.pdfIn PDF document text
    • http://arenaprobet.com/55086888373ypoas.pdfIn PDF document text
    • http://hurleyshamburgers.com/pokemon_sun_and_moon_legendaries_shiny_lockedd5ref.pdfIn PDF document text
    • http://fito4ka.xyz/ritukedy1fdl.pdfIn PDF document text
    • http://otshelnik.net/probability_and_statistics_worksheets_with_answerswcods.pdfIn PDF document text
    • http://meziradidanaru.iblogger.org/duginagoxedasox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muvipej.atwebpages.com/96069114256.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/que_significa_movimiento_uniformemente_variado.pdfIn PDF document text
    • http://kurejaj.epizy.com/hunger_games_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f75b2476-a00e-4fb7-833b-0dac220edef8/enemy_pie_writing_activities.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/free_dyslexia_worksheets_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea179055-ad2a-4a09-9bd4-b6c207a54f2a/jujugakafukozixadonidewuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5b2e474-810b-4fb0-b1cf-e0932488511a/how_to_get_a_covid_test_in_hendersonville_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/lumuzowawevotemulusunat.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 5628 bytes
SHA-256: ec57b4e238cb837efd7300374f0734fd5e84ecd9be00acdbf478482955f0ae1c
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 12492 bytes
SHA-256: 921b3aee83e17857949f03c1cae6c03d8dce41461592cfd1324cebc63885fa0b
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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