Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bfee51e3db5fe07…

MALICIOUS

PDF

73.4 KB Created: 2021-03-09 04:15:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d883fd8f87de38b83111f823d73503ed SHA-1: b74884c8cf12773ca7c50e86f9f4d8a8ec4dbe94 SHA-256: 2bfee51e3db5fe07ed6d06c535f95be63bfd4e9d4151bad9a9fde5be41afcc14
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm designed to direct users to other sites. One prominent URL, 'https://golowaki.ru/123?utm_term=payment+icons+free', suggests a lure related to payment icons. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=payment+icons+free
    • https://static.s123-cdn-static.com/uploads/4403556/normal_6007b106e1510.pdf
    • https://cdn-cms.f-static.net/uploads/4370985/normal_6033bc4c43531.pdf
    • https://tekipagitew.weebly.com/uploads/1/3/4/8/134871071/747b3d63e01.pdf
    • https://static.s123-cdn-static.com/uploads/4475715/normal_6007a161bb84b.pdf
    • https://gozerezujokosas.weebly.com/uploads/1/3/4/8/134856803/aa58fa053b77df.pdf
    • https://cdn-cms.f-static.net/uploads/4450428/normal_60401d1c23e47.pdf
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/jogezen.pdf
    • https://telenegogak.weebly.com/uploads/1/3/4/5/134522167/fdb6e3e4.pdf
    • http://gilumesu.mypressonline.com/fourier_transform.pdf
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/5255938.pdf
    • http://didazema.mypressonline.com/flashback_x4_toneprints.pdf
    • https://vevumugenewasu.weebly.com/uploads/1/3/0/7/130776279/dd1b2c313.pdf
    • https://cdn-cms.f-static.net/uploads/4371261/normal_600bf8a51681a.pdf
    • https://cdn-cms.f-static.net/uploads/4480382/normal_603d446648efc.pdf
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fd0b68c15766.pdf
    • https://bugomalaked.weebly.com/uploads/1/3/5/3/135324661/f4b657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_f12d11667ef94b8789aa4457976bf58f.pdf?index=true
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_ca40bf895efa4fa8ba466c47af31774f.pdf?index=true
    • https://7fe1f042-206b-4735-a408-f56337efeeb4.filesusr.com/ugd/d34b51_902724fe098640f9be79d2001dc03e9e.pdf?index=true
    • http://rosajeku.myartsonline.com/princess_bride_movie_free_online_full.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_off0000e427.bin
fe065e433491d82eabbbbf419f97a093b32831b004ce5b0c9050f2f03b08b7d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE427 5096 bytes
font_01_sfnt_off0000f571.bin
654c1512f38a476302e618fe2b4c1a599d412a5f5a5e8027af2610024ec78a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF571 10328 bytes

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