Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9a9e46386f6b3b…

MALICIOUS

PDF

78.8 KB Created: 2021-06-03 06:29:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 72807a189b4c7f52b8dd0aaf486fd515 SHA-1: 91235c2fb4f7b5c5550c0aac048448d532817a41 SHA-256: dd9a9e46386f6b3be887cf326d44291212bb6fdea6cd413cfd79b65019dd1ae8
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm. The primary malicious URL is dugedepap.ru, which is likely used to redirect users to further malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to direct users away from the document, potentially for malicious purposes. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dugedepap.ru/123?utm_term=calibracion+de+una+aspersora+de+mochila+manual PDF link annotation
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/kunujidoxasavawog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486751/normal_60161a2665cd0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415742/normal_5ff2dd6372bd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480387/normal_605131617981c.pdfIn PDF document text
    • https://zufakuka.weebly.com/uploads/1/3/4/3/134343409/2899211.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/zujabus_valexipodex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414869/normal_604a1823d1d74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_6035a899ea5ec.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5ffb53b1a2d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5fda9192a534d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5ffbec9d5ef9e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2857712c-90f4-4a4d-8030-1e1f83db1f37/how_much_do_male_social_workers_make.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/f/19729028521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d92dc45-7333-4a76-b093-c15d3ec20564/86530006771.pdfIn PDF document text
    • http://vifogajo.pbworks.com/f/kugoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94b922a7-6ac1-4cc1-937e-8c3c14d85ec2/pdf_lista_de_verbos_regulares_en_ingles_presente_pasado_y_participio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42285f15-70af-4d43-b1b9-7bc084b57943/gothic_elements_in_wuthering_heights_sparknotes.pdfIn PDF document text
    • http://nebapelamive.pbworks.com/f/simile_and_metaphor_worksheet_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3cf63a-ec71-4848-b004-947cbc8ca7c5/tom_clancy_novels_made_into_movies.pdfIn PDF document text
    • http://mapaduzipi.pbworks.com/f/kozivadifusiso.pdfIn PDF document text
    • http://gamaxidad.pbworks.com/w/file/fetch/144535995/44423824897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8704b7d-f8a1-4ee4-a0ef-42adb9f45d6e/collection_counter_to_dictionary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cc47a7e-d7f9-47e1-9efd-8d0389780f67/guitar_chords_for_old_hindi_songs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a599f95c-88d5-4403-a7eb-98349eb7ca9c/xuxut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77ca2142-d9e2-44ce-888a-85cff6dd7e85/how_to_be_trans_without_surgery.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_off0000f6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CB 5356 bytes
SHA-256: 61073837f240ec9dbb3d118a8c0b34c2cb88e6fa33043c11feaf704fb3a2ccca
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10520 bytes
SHA-256: 14daad7c943075e4dcb440f650dd8b389b88a58242fe8f1ef96154136b57aa85

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