Malicious PDF — malware analysis report

Static analysis result for SHA-256 09d59a5e6b111c74…

MALICIOUS

PDF

78.2 KB Created: 2021-03-07 14:12:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a3ec36cb14c103c2f84b9f5e4c5d05 SHA-1: 025d5b4b4334d16fa967d2a1a791cd87d0956c3d SHA-256: 09d59a5e6b111c74b4c8220f7c22321edc1661886975da30dc1da5838f9705b6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to various PDF files, suggesting an attempt to distribute malicious content or engage in SEO abuse for phishing. The presence of embedded URLs and the overall structure strongly indicate a malicious intent to redirect users to potentially harmful sites.

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://nipisod.ru/wix?keyword=pythagorean+theorem+test+answers
    • http://roman-holidays.shop/emotional_songs_mr_jatt7gv9x.pdf
    • http://faxusupovetek.sportsontheweb.net/63864604095.pdf
    • https://vemenujobife.weebly.com/uploads/1/3/5/3/135399872/7800640.pdf
    • https://cdn.sqhk.co/soxesemu/PQAH0ja/ferrari_driving_experience_los_angeles.pdf
    • https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/28c0b3.pdf
    • http://memowelubi.mygamesonline.org/vizio_sound_bar_5.1_manual.pdf
    • https://cdn.sqhk.co/sarafogu/g3F19w4/top_up_my_eir_account.pdf
    • https://cdn.sqhk.co/jemowevu/94iCSRM/wukixoser.pdf
    • https://cdn.sqhk.co/tawavumazo/ehejgwD/25906742571.pdf
    • https://nixunirebexif.weebly.com/uploads/1/3/0/7/130776125/099c9.pdf
    • http://bodyita.space/baby_monitor_phone_appnwloq.pdf
    • http://hookup756.fun/xokowobalopipazadud3rnye.pdf
    • http://movawizaxaxato.mywebcommunity.org/sunbeam_heated_blanket_directions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jolozidabi/vejakofip.pdf
    • https://s3.amazonaws.com/mukut/tanatologia_forense_unam.pdf
    • https://s3.amazonaws.com/kotenu/briggs_and_stratton_repair_videos.pdf
    • https://s3.amazonaws.com/ruzaganog/shutterfly_upload_app_for_android.pdf
    • https://s3.amazonaws.com/gedimuta/ratijilij.pdf
    • https://s3.amazonaws.com/wuzalugiseto/deutsche_orthographie.pdf
    • https://s3.amazonaws.com/xidulumexi/gukafegopikovof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8e3.bin
142781a0cb1d272c2c7b533c1991ca1093d6871fd40ecb804e72cfe518be4616		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E3 5000 bytes
font_01_sfnt_off0000f9b8.bin
9fd2ce23aeaff66b034b1bc4388a6366e22291212389f93cf928dd593ffad441		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 10424 bytes
font_02_sfnt_off00011d2c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2C 4324 bytes

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