Malicious PDF — malware analysis report

Static analysis result for SHA-256 a934eb022e33a857…

MALICIOUS

PDF

83.7 KB Created: 2021-04-02 15:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43641d4742e4950d96017441d4488ae SHA-1: 6cf485bb81436f7ab86f0cda233ef48e02a9643b SHA-256: a934eb022e33a8571426ec061eaca0d338d37cd4fda2b53cd10d610d98ab7ffb
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating it is part of a link farm or SEO spam operation. The primary URL, https://kuzutuzo.ru/award?keyword=geometrical+interpretation+of+integration+pdf, suggests a lure to attract users searching for specific PDF content. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links.

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://kuzutuzo.ru/award?keyword=geometrical+interpretation+of+integration+pdf
    • https://wosabawa.weebly.com/uploads/1/3/5/3/135390578/jojajajelo-fegiroki.pdf
    • https://cdn-cms.f-static.net/uploads/4470977/normal_5fdc6c3740fa4.pdf
    • http://fepemewavitik.66ghz.com/la_biblia_en_audio_libro_de_mateo.pdf
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe51200dcc4a.pdf
    • https://zisowuwaxafo.weebly.com/uploads/1/3/4/7/134700917/zuxol-vajojifoki.pdf
    • https://static.s123-cdn-static.com/uploads/4450040/normal_5fe409dd30625.pdf
    • https://static.s123-cdn-static.com/uploads/4450151/normal_5fd0660e5999e.pdf
    • https://bolomomotune.weebly.com/uploads/1/3/4/7/134762543/tugujod_zefosuwi_bemuwob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/megodipewukitoj/breakdance_music_video.pdf
    • http://sidinikoxa.epizy.com/79002970935.pdf
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_f93b75ef2cfa4982b0b415d295766fca.pdf?index=true
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_33d1f3561d084982ab99f51cbcb9b67d.pdf?index=true
    • http://teruwisap.epizy.com/gewajulag.pdf
    • https://s3.amazonaws.com/zunaduxa/tudadukapomujopa.pdf
    • https://48936d5e-4b15-4059-a328-ddb12afcc15e.filesusr.com/ugd/173145_eb623e07cd1646cdb510c2f93b9f9f12.pdf?index=true
    • https://s3.amazonaws.com/nitizobuv/zilexosopovikazunipitaj.pdf
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_5e939b393b55454393842278eac0bfe2.pdf?index=true
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_42a23b5868694b1d8fca8e399c9ebbd0.pdf?index=true
    • https://s3.amazonaws.com/xulepiwa/cisco_spa8000_default_password.pdf
    • http://lasuwutiganije.rf.gd/57002767071.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d0.bin
3dde453759ee12c85b210a089023fdfaad86768b954ea441c78fcb6adbe4a11d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 5116 bytes
font_01_sfnt_off0000f41c.bin
f3f75710cb0bfcefd6e9b814fb972abf1902830a02ed6f291738a37ba6a9853f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF41C 11892 bytes
font_02_sfnt_off00011d66.bin
91deeb67dd81a08e94bfe2ff4e559facad0d616951a8a20fbf16f68f5112d408		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 16208 bytes
font_03_sfnt_off000132b5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B5 4324 bytes

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