Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b8cc7ebf3d3fb3…

MALICIOUS

PDF

80.9 KB Created: 2021-05-28 11:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c892b85f12708c8854db71b9d6fea74 SHA-1: 9e16777e74cb50f04c632ccefbf9e907ceed97c9 SHA-256: c2b8cc7ebf3d3fb32689a9bc8605396cdba7b45f98bab54d797164f68d61b001
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' indicates the presence of a large number of external links, with one prominent example being 'https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/duwobazunad_zorajad_guvulosadezu.pdf'. The embedded URL 'https://jacksth.ru/123?utm_term=myopenmath+homework+answers' suggests a phishing or scam attempt disguised as homework answers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jacksth.ru/123?utm_term=myopenmath+homework+answers
    • https://tulapubilogu.weebly.com/uploads/1/3/4/8/134881906/duwobazunad_zorajad_guvulosadezu.pdf
    • https://cdn-cms.f-static.net/uploads/4376374/normal_605b7c5fe55d2.pdf
    • https://cdn-cms.f-static.net/uploads/4379384/normal_6039746dd1f96.pdf
    • https://xexifenenufomag.weebly.com/uploads/1/3/6/0/136082553/rilitezenezu.pdf
    • https://cdn-cms.f-static.net/uploads/4391920/normal_600bfd5370f81.pdf
    • https://moxiwomalupul.weebly.com/uploads/1/3/4/5/134598527/338d85dd7.pdf
    • https://zuwuroxiver.weebly.com/uploads/1/3/1/0/131070979/mabam.pdf
    • https://cdn-cms.f-static.net/uploads/4479210/normal_601c88eb8627c.pdf
    • https://static.s123-cdn-static.com/uploads/4527859/normal_6000884ba2081.pdf
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/gukixepojosus.pdf
    • https://cdn-cms.f-static.net/uploads/4481403/normal_604b3e07418f4.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/a1e7136fc.pdf
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/1302399.pdf
    • https://static.s123-cdn-static.com/uploads/4465151/normal_5fcf2c2a8476b.pdf
    • https://ronewomiz.weebly.com/uploads/1/3/0/8/130874064/da986fc274.pdf
    • https://demijogukif.weebly.com/uploads/1/3/1/3/131382539/fajejukam_gewegobev_papilivoxemipe.pdf
    • https://cdn-cms.f-static.net/uploads/4448332/normal_6017d4d9870ea.pdf
    • https://fusodozot.weebly.com/uploads/1/3/4/0/134096428/nabifudarosav.pdf
    • https://topifovav.weebly.com/uploads/1/3/4/5/134595147/718b2fffd.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_601f53497474d.pdf
    • https://burodinijosago.weebly.com/uploads/1/3/0/8/130813714/4834782.pdf
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/vidulu.pdf
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/sezobagawoje.pdf
    • https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/8045470.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf119e78-3614-4518-91d4-360c103d4fc5/10530864755.pdf
    • https://uploads.strikinglycdn.com/files/5819a6a7-13cb-4a37-8f43-f97df8ec7ac4/57817350313.pdf
    • https://uploads.strikinglycdn.com/files/3f256774-df2f-4f0f-93db-04da6969c519/dezoz.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_off0000fe52.bin
4deb969f7b9be7eda513d3594bccd65e5ad834d75f4e07bbb4f4aa7b4a4a8031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 5288 bytes
font_01_sfnt_off00011044.bin
01518fdcf1c5096010119d4ce62fe1dcf22906fc4312dc4e29bc10d2880bb6ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 11108 bytes

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