Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7128667dcc42e4…

MALICIOUS

PDF

75.1 KB Created: 2020-11-14 07:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 2c9778d80212152783e60ba1666dc06b SHA-1: 1d7967f86e960f46f9f53c3548d2a8bf24aba0ee SHA-256: da7128667dcc42e468f09395d1760ead8595602872ec92bb39554f2f562908f1
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a significant number of embedded URLs, many pointing to disposable hosting and likely part of a link farm. One critical heuristic indicates a link to known malicious redirector infrastructure. While no scripts were extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious content, potentially for phishing or malware distribution.

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
  • 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://cctraff.ru/123?utm_term=teorema+de+morgan+adalah In PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/sisejin.pdfIn PDF document text
    • https://xigokerurubupa.weebly.com/uploads/1/3/4/3/134312623/jojakirak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_5f8cc651ac61d.pdfIn PDF document text
    • https://rinavufapakoto.weebly.com/uploads/1/3/4/4/134460237/fabemelazaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_5fad6fb104a02.pdfIn PDF document text
    • https://kaxokotul.weebly.com/uploads/1/3/4/3/134380066/c2422d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472495/normal_5fa57a01d5bd9.pdfIn PDF document text
    • https://gavuzolarot.weebly.com/uploads/1/3/4/4/134458525/2433767.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/17674981034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dbd9120-c3d7-439f-b572-34a5204d4932/depobolugafane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cdd7508-dda8-4123-8aa4-93d2f8fda1ed/36177055837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af36741-2f27-49d2-a13e-bf94373455d6/164870178.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd65b07f-ba82-4b68-be69-7f88c665350c/55407784780.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_off0000d039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD039 5008 bytes
SHA-256: 676a7e1c9c0ae7362baccdd6a6485034b892df469e9288f3f86f4cd51dee9f39
font_01_sfnt_off0000e10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10C 12188 bytes
SHA-256: 1505616d3ac224b7265c430c3bc7bc26f0b61dc57ee7c6573a875347ecd29f13
font_02_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 16128 bytes
SHA-256: c6d15a48544a3bb55b86c8e7bdd0e7cb70a7a2427dd0dd016b970b4b8641d415

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