Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda28c12834b9122…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 17:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9bcd4d660f60d96be977856909fcb705 SHA-1: 214d7a4e27bbb36c2872fa002205b91384f00a71 SHA-256: cda28c12834b91229878e3076a0909611b599cb231b3eff188c050962c53c377
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or content stuffing tactic. The primary external URI points to a URL that appears to be a lure for users searching for specific book PDFs. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to potentially malicious or deceptive content, likely as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://kuzutuzo.ru/123?utm_term=black+panther+party+books+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465012/normal_602bf697096c4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476566/normal_6020a993f35b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_601b049179117.pdfIn PDF document text
    • https://cdn.sqhk.co/vaxikinanibu/LSVieCF/bulakomijogaxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391909/normal_5fe25a4295122.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/iIjjjjP/international_superstar_soccer_deluxe_snes_vs_genesis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_603ea1107de5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370307/normal_604154939860d.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/idgivhj/toy_blast_hack_without_human_verification.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_600fc8b2547a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413375/normal_5ffdb6bb35b41.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409393/normal_5ffe96ef8399d.pdfIn PDF document text
    • https://cdn.sqhk.co/visobipibe/iGUZXI2/39096313737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393791/normal_5ff80d2171e8c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456119/normal_600eb77b1916c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490269/normal_6032793f97d31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426267/normal_5fe784978f316.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422134/normal_5ff4c8fdd4d89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367905/normal_5ffe0f3a580cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5ffcbabb8e28f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376120/normal_5ffbe4921ecab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e627107-309b-4451-a84d-e7064c41fccd.filesusr.com/ugd/04c368_e2631981b311413c97f9a29f5824d0b5.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_4a76a957fbbb479faccdb477d2c62dc2.pdf?index=trueIn PDF document text
    • https://e5720c39-3c1c-4a52-9be9-509675281b5a.filesusr.com/ugd/0010c8_9971d83aea644a0c81ad8c445b414436.pdf?index=trueIn 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_off0000edb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB6 5600 bytes
SHA-256: 811c6a78a9d0d12006e7365a35bf90c5b00810808fd76c98c6d7a766b32d3521
font_01_sfnt_off000100be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BE 10992 bytes
SHA-256: 839b7e6b590de43174c7d977b91b6cff9030d272d79bf95c31d0b9e26ff08888

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