Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa698db7503773f6…

MALICIOUS

PDF

84.8 KB Created: 2021-05-09 13:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6ee6d2e0e6529c461d8def76f751c272 SHA-1: ef6ee35dad475e6c061b36cf94c808c7f781a8b1 SHA-256: aa698db7503773f661ec842386240016c180da9ae4ff53469b667cb1844f1efa
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to suspicious or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://seumenha.ru/strik?utm_term=best+graphic+novels+for+10-12+year+olds PDF link annotation
    • http://biwumani.mywebcommunity.org/jugij.pdfIn PDF document text
    • http://youralteragoods.com/steve_king_net_worthf9gdc.pdfIn PDF document text
    • http://uber-global.com/sentence_fragment_worksheets_high_school_with_answersobh17.pdfIn PDF document text
    • https://jeroxesomob.weebly.com/uploads/1/3/4/5/134584548/nenuvatijiwofe-zujazupatewupe.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/reparu.pdfIn PDF document text
    • https://judikojegewag.weebly.com/uploads/1/3/4/5/134583508/2d3995fd1d7ba.pdfIn PDF document text
    • https://bosopezimewuzur.weebly.com/uploads/1/3/4/3/134313362/sofomubudujipivivo.pdfIn PDF document text
    • http://surupumigo.mypressonline.com/palliative_care_nursing.pdfIn PDF document text
    • http://olx-delivery.cc/4624179102766aah.pdfIn PDF document text
    • http://blue-tick-central.com/tijomivisavodakip5pg1.pdfIn PDF document text
    • https://lilobisuzi.weebly.com/uploads/1/3/4/6/134695815/jarerebaxeza.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/kopapidasu.pdfIn PDF document text
    • http://com-login8.xyz/wifi_analyzer_android_109b2nn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/mukutud/jowatusof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/766d59df-c4af-42a6-9023-09808098d50c/miele_c1_vacuum_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/st_blends_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90032306-6217-477d-b12e-137395906bdc/laboratory_manual_for_principles_of_general_chemistry_10th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c24f9aa8-fad5-47d4-a172-eede14ee2b7a/how_to_fix_an_electric_fireplace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0d83c6-54f8-4fda-9a08-526a74399a19/53618521788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b219e14-7ceb-42c3-a48c-c834fbe9136b/audiolibro_la_maestria_del_amor_descargar_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/singular_and_plural_nouns_sentences_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e034190-d23b-4546-9ab4-5030f2d5cf6f/pitifit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12ba828b-1e46-4720-a663-f614ae0c889c/powerpoint_presentation_on_trigonometry_for_class_10th_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/senor_wooly_adonde_vas_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/64690321225.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 5776 bytes
SHA-256: f4e2855c5c279b2d1773061a8050e26f5df60d66dddda1ba8b0c029fe02906af
font_01_sfnt_off0001126d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126D 10844 bytes
SHA-256: c58b9ecdb7ccc44d592fcce9dbd63fd09747e6af93bf4d2de0b9c7d0d2e70cc6
font_02_sfnt_off00013747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13747 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333