Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ba450b59a2bbe2…

MALICIOUS

PDF

68.5 KB Created: 2021-04-05 12:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d15cfabb044061df73046eb7b924b52a SHA-1: 5ae9357dce7a95a5aaf68f4e51d4c265b6e64d55 SHA-256: 28ba450b59a2bbe2705000bbdb9575e5cb10e8b9575ce4d807d7937ec5e8ba29
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://botokaw.ru/strik?utm_term=hatha+yoga+postures+images', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=hatha+yoga+postures+images
    • https://cdn-cms.f-static.net/uploads/4454306/normal_600a992c724b6.pdf
    • https://cdn-cms.f-static.net/uploads/4493888/normal_5fe9c2295dc87.pdf
    • https://static.s123-cdn-static.com/uploads/4475716/normal_60020bfed9bbe.pdf
    • https://cdn-cms.f-static.net/uploads/4482638/normal_60443ea195730.pdf
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd12a14e6e8c.pdf
    • https://cdn-cms.f-static.net/uploads/4366980/normal_6032d7173107c.pdf
    • https://static.s123-cdn-static.com/uploads/4392652/normal_5fde57413cb5d.pdf
    • https://cdn-cms.f-static.net/uploads/4476564/normal_6025cfd7d424f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b1b7c149-b198-48f2-ad06-4daa5b30ff82/buddy_lee_jump_rope_program.pdf
    • https://s3.amazonaws.com/daselex/mulavasodosukiremav.pdf
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_b6a5137e093b4a848f9089af9aac0cb6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b03ea91-3b33-4e28-8414-6efc10cb060b/63190459216.pdf
    • https://s3.amazonaws.com/jevelel/31686704824.pdf
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_162332747d5e4d9bb29dc7211f396a7f.pdf?index=true
    • https://e72deea9-3c4d-48de-8429-d2e8e2d5d9b3.filesusr.com/ugd/68b2df_21e28c4b966d41598ef3e4695f4cefd6.pdf?index=true
    • https://s3.amazonaws.com/kafises/povirabo.pdf
    • https://s3.amazonaws.com/jeponowon/toxukanubolozixekuli.pdf
    • https://s3.amazonaws.com/kibavutibeved/dezitinolirixivisewagufan.pdf
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_a335a80339804bfa93f13309167e9f37.pdf?index=true
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_d6c5edde456a4349b35cce4b0993211c.pdf?index=true
    • https://s3.amazonaws.com/rubidokezive/jenuri.pdf
    • https://s3.amazonaws.com/fewunadupop/31884682431.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d08a.bin
7e7e2f5ceebdb10c3772e493537cf5190f10513cb02b0719a9fd357567c719f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD08A 5264 bytes
font_01_sfnt_off0000e256.bin
bc2c851ddc0dcbf69805edc70902d25fd7875d8bba474f1b96286365a47fa150		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 9988 bytes

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