Malicious PDF — malware analysis report

Static analysis result for SHA-256 47f4874af285d231…

MALICIOUS

PDF

70.9 KB Created: 2021-06-05 15:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bebe9f20f38e2f69e133656a36a986c6 SHA-1: 5d118c70f256065e096d216d22cb8ca194ab2fdf SHA-256: 47f4874af285d231e1c8943e237ba5118fbd51d25359e1c2b0e43438bc93d956
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://crewmak.ru/pbw?utm_term=funcion+logaritmica+definicion+matematica, is particularly suspicious and likely leads to malicious content or a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://crewmak.ru/pbw?utm_term=funcion+logaritmica+definicion+matematica PDF link annotation
    • https://fuwexizadosilu.weebly.com/uploads/1/3/5/3/135318643/5359845.pdfIn PDF document text
    • https://buvujufa.weebly.com/uploads/1/3/1/3/131379824/perejome.pdfIn PDF document text
    • https://kaxobemux.weebly.com/uploads/1/3/4/6/134676595/momevibis.pdfIn PDF document text
    • https://nabizajeti.weebly.com/uploads/1/3/4/6/134640454/4834233.pdfIn PDF document text
    • https://fidunisowasewi.weebly.com/uploads/1/3/4/5/134599354/7285389.pdfIn PDF document text
    • https://sudusiwigi.weebly.com/uploads/1/3/1/0/131069987/2ff90a59ed0.pdfIn PDF document text
    • https://gawokuvaz.weebly.com/uploads/1/3/4/6/134656265/vijirisabetuvol.pdfIn PDF document text
    • https://salabupomisopef.weebly.com/uploads/1/3/4/6/134631393/50ad654b1a180e.pdfIn PDF document text
    • https://xopubisewono.weebly.com/uploads/1/3/4/5/134507782/fizonogi.pdfIn PDF document text
    • https://finukapaxareb.weebly.com/uploads/1/3/4/4/134494590/judixafezibu.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/6344517.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamaxidad.pbworks.com/f/lebajobiroreto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f472aa4f-fe26-4183-b9ed-09e045c8f90b/bebewowev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bf94e72-146a-4306-a9de-5065566c955f/sojourner_truth_aint_i_a_woman_speech_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d2dbca-efde-4949-b656-673e7b6edd8d/when_will_season_4_of_sword_art_online_come_out_on_netflix.pdfIn PDF document text
    • http://poforezufovu.pbworks.com/w/file/fetch/144588432/xafefidebixi.pdfIn PDF document text
    • http://gapufipi.pbworks.com/w/file/fetch/144539484/zajilidabikukuko.pdfIn PDF document text
    • http://redejok.pbworks.com/w/file/fetch/144563244/nitaxamenabika.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1309a32f-578e-4c2a-b59e-099168c1db48/kufigowanonupisasoralo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17416569-394f-46dc-9d06-2b46c93245d7/what_is_the_best_treadmill_workouts_to_lose_weight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f503926-1509-4a37-9423-d5878ede5a2a/how_to_tell_if_your_baby_corn_snake_is_hungry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3c8c2f0-4ff6-4cfa-8654-3f350cfbd237/bamanafetufamepojujoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9db4e0a1-6eac-4d6f-87ce-e7efbd8d7f9a/how_to_use_dexter_commercial_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/862547c4-b374-49e9-9cd7-bc3e9cb5d02d/43501089281.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_off0000d5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D7 5120 bytes
SHA-256: ec7a3cdda8601e550caeac8f2b9d98f4e66b9709452a1048ca2b747e9f88258a
font_01_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 11064 bytes
SHA-256: 542b543edee3e6cbdb3225d85e78ef6952adb188be1b39015ecc5ad62132f5d3