Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba8cb94a1a21d3e…

MALICIOUS

PDF

60.4 KB Created: 2020-11-17 04:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 9f0c11fc811a3f4c92b8ba3555577379 SHA-1: e8ad05fb385436ca67348031f64e7aa0ffb124b5 SHA-256: bba8cb94a1a21d3e60403c7d6e65554ffdb2a2c3b479a517cf5add0c5e620ea7
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many of which point to disposable hosting services and redirector domains, indicating a link farm or phishing lure. The presence of a known malicious redirector URL and ClamAV detection further supports its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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.
  • 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://gettraff.ru/123?utm_term=what+is+smart+resume+on+xfinity+cable In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378171/normal_5f8db5de2f2f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368979/normal_5f87aec5c5711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f9587cfb6a19.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/e80b7c2d.pdfIn PDF document text
    • https://bevibobozile.weebly.com/uploads/1/3/4/7/134700853/zijaboxulama-fidupivu-tukogodubuwaz.pdfIn PDF document text
    • https://redilabow.weebly.com/uploads/1/3/4/3/134316718/9876578.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/3218331.pdfIn PDF document text
    • https://rukazoxet.weebly.com/uploads/1/3/4/0/134040508/rujadifininizalej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_5f984101e7447.pdfIn PDF document text
    • https://joguwezur.weebly.com/uploads/1/3/4/5/134500750/889036.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/a7427780-5cb9-4c95-91d3-12891c5c5b59/charles_bukowski_books_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8db067-d2c6-4eb4-98ea-04b6b35050e9/walmart_cashier_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95dcc88a-3cb1-4c74-8680-f5684a6d38ea/16254809076.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_off0000b156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB156 5444 bytes
SHA-256: 57aa557cd442cd1a9c9a15096d66619981e00b8250aa17b300e786040f99bda5
font_01_sfnt_off0000c3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CA 9688 bytes
SHA-256: 68a82f5c92941105eb3d94056bab918b63db4eb280ebcdc8c9473c5003d682e2

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