Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe16016314cae9…

MALICIOUS

PDF

71.9 KB Created: 2021-02-27 15:38:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 84cb7d195396bdf2565848da6db588d6 SHA-1: 3ada13fe5a24140f8097924194965f5071d811f1 SHA-256: 86fe16016314cae946252408be1145ca4b7749bfed6314d2b40d95eafb29bcb8
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://kuzutuzo.ru/wix?keyword=chloroplast+structure+and+function+worksheet+answers PDF link annotation
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/9835171.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/9413281.pdfIn PDF document text
    • http://jovupudalapeki.22web.org/new_cg_song_2018_dj_remix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369491/normal_5fd8763666361.pdfIn PDF document text
    • http://punejew.mygamesonline.org/84184466196.pdfIn PDF document text
    • http://kiritisivasol.mywebcommunity.org/91444269626.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/naputosifun-zizevex-fikisanomepexe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vifasuwa.epizy.com/dakopuxido.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/81504068011.pdfIn PDF document text
    • http://dawovizi.epizy.com/fosokazikubob.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/distinguish_between_fifo_and_weighted_average_method.pdfIn PDF document text
    • http://xebowuruno.epizy.com/prefix_suffix_root_word_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/korapelozo.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/cinema_4d_r20_tutorial.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_off0000dd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD95 5304 bytes
SHA-256: c6cb467b34c8ea362851f20a42046159e34d7875e029bb4efc1cdfefe1317072
font_01_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10136 bytes
SHA-256: d3a04701ff2756e79e193eced859f1be49328e9ce79325ac2df9100ccf07bb18