Malicious PDF — malware analysis report

Static analysis result for SHA-256 098546abb529cf47…

MALICIOUS

PDF

85.0 KB Created: 2021-06-10 18:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: bf129b036c5bdef83250e0796b04cb4e SHA-1: 0a555ba81e80f9e2b1e6c1598cdd8b2ba8612e31 SHA-256: 098546abb529cf47d7ec55c4d4bd31a6f9bb2d5a9dd7dd4dc2af1799d87de2e4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a tactic of using a link farm to facilitate initial access, possibly via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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=download+trueman+elementary+biology PDF link annotation
    • https://jenifamizoj.weebly.com/uploads/1/3/5/3/135319667/kudifefenojixit-ruxem-retujulusuviv-kerilobopamene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462368/normal_600aa2ba27253.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/tevafo.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/finatesuw_zuwamajilijeren_sigoladujezup.pdfIn PDF document text
    • https://kuburabet.weebly.com/uploads/1/3/4/3/134362545/843553f092b2db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480753/normal_606d6c946e49e.pdfIn PDF document text
    • https://sidufuzijek.weebly.com/uploads/1/3/4/5/134598689/12294b7a40c.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/274706.pdfIn PDF document text
    • https://mevavenepid.weebly.com/uploads/1/3/1/6/131637679/5fa23.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/414f98d2-1453-44bc-9e4b-11f3164722e6/jaged.pdfIn PDF document text
    • http://gipuwufi.pbworks.com/w/file/fetch/145017585/gta_v_mod_apk_download_android.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4750fcb-54d1-4407-90c6-ac4946be8fa3/flowers_for_algernon_movie_adaptation.pdfIn PDF document text
    • http://zorisomofi.pbworks.com/w/file/fetch/144869550/decorative_fusion_knots_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c947cbb7-bc97-4fab-9fd6-2dc6b3b0a437/dell_gx620_audio_driver_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1e8a8b-74e2-40d0-b94a-46649d102835/what_is_the_best_brand_of_washing_machine_in_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf003b2-8e33-414f-98a0-7b370d1d216e/swales_2004_cars_model.pdfIn PDF document text
    • http://pudamalulera.pbworks.com/f/93275148014.pdfIn PDF document text
    • http://patimedudemu.pbworks.com/f/what_is_rca_input_on_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b35859-99ba-4532-b570-6999c770c568/38552226501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcbccd04-3180-4e1a-8f7e-a7fe07c7e74f/82209580800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c763af7-dcd5-4695-982b-9e5bfb475009/jifutupu.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/newisuxugofu.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_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 5300 bytes
SHA-256: 9665bf403307ce87ba95645afd053e3a3d14f8e7a4a75af2207122342005c779
font_01_sfnt_off00010998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10998 11260 bytes
SHA-256: 624fe4ade390afc418dfd8040f514003fe46249f6d99eb94f00e9b4ebf872dc0
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 16336 bytes
SHA-256: 63ea0af8218f446c6951f657c90afa72f831e8a0c9caeff0df73427b8f47130a

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