Malicious PDF — malware analysis report

Static analysis result for SHA-256 8608a90f93a9f5f1…

MALICIOUS

PDF

81.8 KB Created: 2021-03-10 23:14:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 939880b4ef776f784d31e2da3fe0a505 SHA-1: d109e27fc9d834f9171f5025304dddcc5826f713 SHA-256: 8608a90f93a9f5f17cb68a6c8305dbd370460324666bdf1641db6381f039a1a6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary URLs, 'https://soxebez.ru/123?utm_term=gateway+b2+workbook+answer+key+unit+8', is suspicious and likely leads to a phishing or malware distribution site. The document body, though heavily obfuscated, suggests a lure related to a 'workbook answer key'. The presence of embedded JavaScript, indicated by the T1059.007 technique, further supports malicious intent, likely for downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://soxebez.ru/123?utm_term=gateway+b2+workbook+answer+key+unit+8
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fe5ec911f82e.pdf
    • https://static.s123-cdn-static.com/uploads/4389108/normal_5fed7ce09bf9b.pdf
    • https://static.s123-cdn-static.com/uploads/4486758/normal_5ff4600e0f4d7.pdf
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fc70dd9e6185.pdf
    • https://static.s123-cdn-static.com/uploads/4386333/normal_5fc72f34ab603.pdf
    • http://tokigarodam.22web.org/2014_chevrolet_ss_manual_transmission.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://436240a4-ef10-404e-ad90-c5cab949c7af.filesusr.com/ugd/3fb742_d409df2183604751bf9f23d22903a218.pdf?index=true
    • https://s3.amazonaws.com/somamere/riwukosenogavinekomi.pdf
    • https://uploads.strikinglycdn.com/files/27c0e50f-502f-4568-ba8f-78618decadbe/graco_my_size_65_remove_cover.pdf
    • https://s3.amazonaws.com/pirosisob/vuvirasigusidapuvunuf.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_c6428735495246ddbe958d380e647a7b.pdf?index=true
    • http://dodemupisam.epizy.com/anand_movie_song_webmusic.pdf
    • http://zerujafulo.rf.gd/at_cafe_6_sub_indo.pdf
    • https://uploads.strikinglycdn.com/files/095f0365-e136-428d-9412-227c28656915/2008_jeep_wrangler_unlimited_x_motor.pdf
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_d0de9bb3b26d4c8190927d60a2a8b97f.pdf?index=true
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_e4ae18b0d3194d5a983a232d8ec758bd.pdf?index=true
    • https://ec2d952e-5494-46d8-b841-fee222248b17.filesusr.com/ugd/9713d5_a1768d2629bf462ba69d11ced9f9cb8b.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
bee585351d707b6df3f38da4cf2a91412b030ddcba30794ba508b7320aff222b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 5400 bytes
font_01_sfnt_off0000fd81.bin
f2d9ec337cad39b2745f48fd6ff8d0ddda929a19d752df981120f065bdb5b047		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 11860 bytes
font_02_sfnt_off00012507.bin
95c8875b86d55676e04387efcab213076c678d08780682413af07ec9fbde7814		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12507 16096 bytes

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