Malicious PDF — malware analysis report

Static analysis result for SHA-256 143cc3fdf2b3c26c…

MALICIOUS

PDF

74.3 KB Created: 2021-04-08 04:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f5da29735cfa4a3b346f615e03d1caa0 SHA-1: c9fd30c501661ddb216411bd90181ad41fd6262c SHA-256: 143cc3fdf2b3c26c58651f7ce2e95d5b8ec023b5f9f2ab656f3b79da9c9a5c12
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one specifically pointing to 'pelibifir.ru/strik', suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=how+to+make+a+coat+for+a+dachshund PDF link annotation
    • https://cdn.sqhk.co/dimowitop/bsLHjdm/6633663243.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/cobeief/clumsy_ninja_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/guranotup/Ejdhdjb/photo_to_video_making_app_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pugudanirav/hcHhgcW/66759621259.pdfIn PDF document text
    • https://cdn.sqhk.co/bisuligiga/QRi9Hgg/82663005130.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_c33ca712f5ab4cbcb42ed02ecccb0f33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fukepez/homeless_bird_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wotodedaruzuk/why_is_my_hp_printing_blurry.pdfIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_5e46c86f83e14db3a67ceb3fd8828b4d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/somirejudatabu.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/how_do_i_connect_apple_tv_3rd_generation_without_remote.pdfIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_0da04bcc1ccb4c418615dbe4b40baee2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/poresi/75198865989.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/lbi_nj_surf_report.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/56980863259.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/76302571874.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwuzerijofa/bryant_furnace_model_350mav_parts_list.pdfIn PDF document text
    • https://79e8b926-cc52-4cef-90ae-68e3990d752e.filesusr.com/ugd/694d5d_5b6c6c4f05254e70900222be1d609c4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/87703063292.pdfIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/sibulelukona.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/bsnl_recharge_app.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_off0000e485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE485 5348 bytes
SHA-256: 379becf60d0b0aae51362a7ab99890fb8f5a8876d5e2c1e7383b3cd8406935a7
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10928 bytes
SHA-256: 2b4405d0c65c746540472f638c8efa22294369aac98d6fad68caaf3e1611fb3d

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