Malicious PDF — malware analysis report

Static analysis result for SHA-256 83acb9c99680eab0…

MALICIOUS

PDF

67.8 KB Created: 2021-01-10 17:56:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: af7eba7cb87d0e2cbb7a78e72380873f SHA-1: 7400c3379dea560a6dbc082b77a6e8c381fb17c2 SHA-256: 83acb9c99680eab0c0fc18cfc41909bb0c2e592308cde164c49bb306b35f704c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it functions as a link farm designed to funnel users towards potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=a+to+z+pawn+rogersville+tn In PDF document text
    • https://vuloribogisoso.weebly.com/uploads/1/3/4/6/134655424/xilevorelit-jabujila-dilugumebi-dawigibafof.pdfIn PDF document text
    • https://nubukagogurug.weebly.com/uploads/1/3/4/4/134495847/mimexazix_wudixajipasolun_kazuvatamugowa_gakatuxuvoginez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376357/normal_5fe7aec7448a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5fe81b84e01d7.pdfIn PDF document text
    • https://zigamebujadosa.weebly.com/uploads/1/3/4/7/134745820/5408373.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453718/normal_5feca107d766b.pdfIn PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/gunosome.pdfIn PDF document text
    • https://vevejeda.weebly.com/uploads/1/3/0/7/130776099/nexubix.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/5468c8b5ffe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449769/normal_5fb34fa7e581c.pdfIn PDF document text
    • https://site-1175422.mozfiles.com/files/1175422/93241974353.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_5fd9b58b1ae0a.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/lalefu.pdfIn PDF document text
    • https://bezubimuxidisa.weebly.com/uploads/1/3/1/4/131453869/8525308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_5f9528496516b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_5fc8289eb47e4.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
    • 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_off0000c0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B9 4964 bytes
SHA-256: 3ed8b26171f810099c94fd324d5df6199b7d33618734824c6178b66b513402b0
font_01_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 9996 bytes
SHA-256: b5aacef8a3cc9099fc7fcf93bd5916dd16ffd3b1bc5c3818f2035899d43a6039
font_02_sfnt_off0000f3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EE 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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