Malicious PDF — malware analysis report

Static analysis result for SHA-256 76e1d52483f07ba0…

MALICIOUS

PDF

86.8 KB Created: 2021-03-02 19:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c642b9b605bede4641eae5dc7060346a SHA-1: 635aa95668b4a802b61a7835004464294857ee11 SHA-256: 76e1d52483f07ba0feb117555954e3d86040811a8bbc3c51586322e8f1fadf3a
164 Risk Score

Malware Insights

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

The file is a PDF containing a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic and multiple embedded URLs. One of these URLs, https://ponafet.ru/award?keyword=how+do+you+do+graphic+design+on+ipad, is presented as a call-to-action, suggesting a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ponafet.ru/award?keyword=how+do+you+do+graphic+design+on+ipad PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365525/normal_6035d77ce6b4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393901/normal_60338edc79d5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495525/normal_5fe2686e1f243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444102/normal_5fd2cba86dee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454300/normal_6004e868580f5.pdfIn PDF document text
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/b276f122f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457590/normal_6013868348bbe.pdfIn PDF document text
    • https://petapizegu.weebly.com/uploads/1/3/4/3/134327096/lubuvazuxupi-nadakevetifuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/birekepamipilo.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/73007908469.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/xitojos.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/cinemax_nitra_program_zajtra.pdfIn PDF document text
    • https://s3.amazonaws.com/pulavokaxe/chinese_circus_hd_video_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/9630458828.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/44504552079.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B9 5460 bytes
SHA-256: afa4500af5561bae267feb8d94f1f27719bf6765b08613f3c1bc16dee17ef42a
font_01_sfnt_off00012a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A59 10476 bytes
SHA-256: 389bab2fafdbaef01b790a7e5f2c08441e8f50bf316eaf3bb8edecb3fd80cc16

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