Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6a70af5df0de51…

MALICIOUS

PDF

71.2 KB Created: 2021-06-11 14:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 559d954024186ad9bbf57a221e7647de SHA-1: 63c9f6332c2b0b4a9cf5e77bb992ae8139d742a8 SHA-256: da6a70af5df0de518790a67c5fdf7f45f4dcc981d39266c16e7cd9239443ac2f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs that redirect to other PDF files and potentially malicious content. The presence of multiple disposable hosting links and UTM parameters suggests a phishing or spam campaign aimed at driving traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/pbw?utm_term=form+jsa+pdf PDF link annotation
    • https://judozolu.weebly.com/uploads/1/3/1/4/131407514/8438217.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369152/normal_5ffa95e58735b.pdfIn PDF document text
    • https://bukanunale.weebly.com/uploads/1/3/5/9/135974016/navavifopoboleg.pdfIn PDF document text
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/pubarofavowanegikin.pdfIn PDF document text
    • https://lepimezuraz.weebly.com/uploads/1/3/4/5/134599896/3237d3.pdfIn PDF document text
    • https://roxuruseni.weebly.com/uploads/1/3/7/5/137504879/6b43bec721c.pdfIn PDF document text
    • https://lufowatevumidoj.weebly.com/uploads/1/3/4/7/134704320/wupivevil.pdfIn PDF document text
    • https://setibadumizokeg.weebly.com/uploads/1/3/4/8/134880372/xemabopikewejulew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601b26e359310.pdfIn PDF document text
    • https://venunuwaxel.weebly.com/uploads/1/3/2/7/132740799/xagijeximajoj_pomasumuxajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://milatufed.pbworks.com/f/how_to_cook_smithfield_spiral_ham_with_glaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee5b89d8-b047-4dcc-b07c-14aad9099f3c/berosefapadogegogos.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/55659604080.pdfIn PDF document text
    • http://kufogokoges.pbworks.com/w/file/fetch/144434469/how_much_is_sheetrock_per_sheet_at_home_depot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df234e0-b11b-4c4c-b1b5-5815454e5250/cut_50_plasma_cutter_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902da0dc-5fab-4dc0-bd51-a58ea17da271/how_to_reset_service_engine_soon_light_bmw_x3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9e720ac-c078-43cc-8a7c-f7bdce0ec076/zujupudotag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19e7494c-53c7-4ffa-9c3c-782a3b22b3d4/what_is_the_price_of_toyota_camry_2019.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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 5188 bytes
SHA-256: ecab2004a500474c9c35c14c56eac6fa9bffdd146712d3b3b226869c623a0d81
font_01_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 10328 bytes
SHA-256: 8a396aadf605a69c61a303ceee534537ab8180d264e10142d137323400c6ab5f