Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fee17f2018e70d…

MALICIOUS

PDF

78.3 KB Created: 2021-05-18 01:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 425eeb3ce4716c619410e8299cbf3581 SHA-1: c3b2581cd0dcf519c42a4dcf8ca79674cd8cc4f2 SHA-256: a9fee17f2018e70d11665fd32be164971da78c6b7030bce4987fca3431ed3c5a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, suggesting a link farm or redirection to malicious sites. The document body, though heavily obfuscated, mentions 'free template slideshow sony vegas pro 13', which is likely a lure to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jottigo.ru/strik?utm_term=free+template+slideshow+sony+vegas+pro+13
    • https://cdn-cms.f-static.net/uploads/4450417/normal_604baf60bb854.pdf
    • https://cdn-cms.f-static.net/uploads/4486763/normal_603aebb89cef6.pdf
    • https://cdn-cms.f-static.net/uploads/4423442/normal_6046ce58b0c81.pdf
    • http://natezaka.iblogger.org/alphonsus_guimaraens.pdf
    • https://junezemojevav.weebly.com/uploads/1/3/2/7/132740237/nawon.pdf
    • https://wimukevefom.weebly.com/uploads/1/3/0/7/130739067/2003487.pdf
    • http://siwutasir.iblogger.org/59891697873.pdf
    • https://rogubofiduga.weebly.com/uploads/1/3/1/0/131069879/sorikadedopa_pofobalubelizil.pdf
    • https://static.s123-cdn-static.com/uploads/4504791/normal_5ffcbe359b007.pdf
    • https://jatupixi.weebly.com/uploads/1/3/1/3/131398141/5373390.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://panadokopejed.epizy.com/simabumobejat.pdf
    • https://s3.amazonaws.com/woneketelak/used_howard_miller_grandfather_clock_value.pdf
    • https://s3.amazonaws.com/gagotaniwipure/apk_bunny_live_streaming.pdf
    • https://s3.amazonaws.com/xifabilejilab/how_long_do_night_owl_cameras_last.pdf
    • https://s3.amazonaws.com/jirebonudur/free_tetris_for_ipad.pdf
    • https://s3.amazonaws.com/ravuxudibure/how_to_take_good_pictures_with_a_nikon_d3500.pdf
    • https://s3.amazonaws.com/wovedukevikov/digraph_sh_worksheets.pdf
    • http://fujebaxe.epizy.com/alan_watts_overthinker_lyrics.pdf
    • https://s3.amazonaws.com/wajufifenoxuj/land_rover_discovery_used_buying_guide.pdf
    • https://s3.amazonaws.com/jojitagifuva/adjectives_form_meaning_in_marathi.pdf
    • https://s3.amazonaws.com/vebisop/ezgo_st_sport_22_price.pdf
    • https://s3.amazonaws.com/wupiwupiwot/candy_camera_latest_apk.pdf
    • https://s3.amazonaws.com/mosezavor/c_programming_language_lecture_notes.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dca3.bin
cbb1c9a728860d720ce37dc30733ca266c72efe07b9105ce51ce2b7256bf3913		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 5800 bytes
font_01_sfnt_off0000f05d.bin
ae18d928e0fe7aa475e1e9408a61b0f77ad283eed21d5c8f671232417729d20e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 10820 bytes
font_02_sfnt_off000115c8.bin
21eb5514ed9cbd54dc859fcaf51db4fd102181e37dfe4e622d35a1b84cfc2466		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115C8 16320 bytes

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