Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac9b4633d6bf9ee…

MALICIOUS

PDF

79.8 KB Created: 2021-04-05 22:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06354d14f58afe0ca136b79039cc7682 SHA-1: d87e6121b86e754b1a72a7697e50381f9e9c69bd SHA-256: dac9b4633d6bf9ee18c3b6f36bf15e9e1d6617648fd327160e66f1ceb93d5f0f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF documents, suggesting a link farm designed to improve search engine rankings or distribute content. One prominent URL, 'https://jumiwimov.ru/wix?keyword=skater+full+apk+free+download', appears to be a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://jumiwimov.ru/wix?keyword=skater+full+apk+free+download
    • https://static.s123-cdn-static.com/uploads/4460725/normal_5feb620068b88.pdf
    • https://static.s123-cdn-static.com/uploads/4407303/normal_5fef983d2be42.pdf
    • https://cdn-cms.f-static.net/uploads/4422659/normal_604cceed67b64.pdf
    • https://cdn-cms.f-static.net/uploads/4483610/normal_6022ce2d5581e.pdf
    • https://static.s123-cdn-static.com/uploads/4387033/normal_5fc6acbd88bb0.pdf
    • https://static.s123-cdn-static.com/uploads/4423136/normal_5fe022627a6e7.pdf
    • https://cdn-cms.f-static.net/uploads/4420775/normal_60397cce80fd8.pdf
    • https://cdn-cms.f-static.net/uploads/4369191/normal_5fe9f9670f6ad.pdf
    • https://cdn-cms.f-static.net/uploads/4380072/normal_60545b081fce6.pdf
    • https://cdn-cms.f-static.net/uploads/4461767/normal_5fda4f9e9f384.pdf
    • https://static.s123-cdn-static.com/uploads/4421224/normal_5ff3f0d54488e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2e907eb7-0cdb-46e5-a4de-ff0e34d1b96e.filesusr.com/ugd/7ea2c5_90f33c18e67d4c30a56f35b90e5a77aa.pdf?index=true
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_34174587f7d84e9799002feb31a583dd.pdf?index=true
    • https://e79dab91-b8ca-4f03-a7cf-74564eaa1d8a.filesusr.com/ugd/009cd4_8572b85ea543429eb558719eee4372e2.pdf?index=true
    • https://e9542b43-fb79-4c62-94a9-c66526381fce.filesusr.com/ugd/4142f3_c39c339456174161af0386a4c0d3b9d2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/88d76bfb-3d6f-4aae-813d-37638e2a317c/the_imitation_game_movie_synopsis.pdf
    • https://86f5e18a-8766-4ae7-b9bf-31430b627380.filesusr.com/ugd/911c12_c5f4c5a562be482cba0f4b3c0268d1e0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e4895b8a-4dd7-4319-934a-7e3b788eaf5b/how_long_should_a_trane_gas_furnace_last.pdf
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_d28e4434f77a4423aa85bf3784f822fd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e4907626-3df9-4186-af0d-bd3d818d9e93/topigiremovetujutisebox.pdf
    • https://469ee322-798e-4c1d-9571-af6764901f97.filesusr.com/ugd/57169b_9c2735ea791e4f8783bde6d9560f9787.pdf?index=true
    • 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_off0000fac1.bin
1ed2e35a09eebee8e0fe35474adabeb93b65ad6cf293e75e5c82d989f44e1364		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC1 5116 bytes
font_01_sfnt_off00010c51.bin
ff6ffb5a91a2631f3f888df3068f34ae340b55fdbe83fe5fc008596b8bd7909c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 11432 bytes

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