Malicious PDF — malware analysis report

Static analysis result for SHA-256 82893dd8a8b34b43…

MALICIOUS

PDF

41.0 KB Created: 2020-10-14 09:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f4fa2168505aae7775c95b07e1747ef SHA-1: 26a8b4c8dc23c5e5d9b1cda85481eb7478618342 SHA-256: 82893dd8a8b34b43561863b526f4bac8b2460c3bb2329482142801a1c1648a05
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are also present in the heuristics, suggesting a coordinated effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?keyword=companion+planting+vegetables+pdf In PDF document text
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/kekikefuwu.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/tigosorivibisakoxu.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/10610.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/digokasawuj-jipamuputevuf.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/fibawubaxavuvabu.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/199877.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/e31a98ee-38b3-43b1-9a1b-de7e3aefa225/bekifalegofavani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/899dfe0b-c53d-471b-ad8b-9b0f6f3ae66a/bivazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30defdac-2f01-4d88-86c5-725f8870624e/rinam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f3667e5-20b4-49aa-b6f8-6fe0db915e56/93932860924.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_off0000626a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x626A 5368 bytes
SHA-256: d093377aa27ed1808eb130e32d1a3a938cbfe1c6763904b37b5a5c2bcfa326d2
font_01_sfnt_off00007496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7496 10404 bytes
SHA-256: 0f34453d69b9a2bb0de0d64eaa7d31b4f53c34bd94e070b2deb4428b6dcc4d43

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