Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d83eb15b3f17d8c…

MALICIOUS

PDF

72.6 KB Created: 2021-02-22 14:36:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c57d3933173eac96d4b5e5c650405a44 SHA-1: 7d35a96a0092000be8463259348c59c40aa96dd2 SHA-256: 9d83eb15b3f17d8c1922e2d1f96d6200f52e289ec05277df9b8056f4731c5967
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/wix?keyword=flvto+apk+downloader
    • https://cdn-cms.f-static.net/uploads/4476941/normal_600f219fd59e0.pdf
    • https://xofoxinef.weebly.com/uploads/1/3/0/8/130874051/1476811.pdf
    • https://cdn.sqhk.co/mopewedote/fibRSjd/lokuwipaxupopovagobusev.pdf
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/a087d3dbf.pdf
    • https://cdn.sqhk.co/kamugututu/hbYheEk/chinazone_tattoo_melbourne.pdf
    • https://cdn-cms.f-static.net/uploads/4368227/normal_601862661d5cb.pdf
    • https://cdn.sqhk.co/pefisemise/hiUgh3z/app_lock_app_download_old_version_2018.pdf
    • https://static.s123-cdn-static.com/uploads/4479236/normal_5fc7ba837cb8c.pdf
    • http://hhizmet.com/round_cribbage_board_templatejhkm9.pdf
    • http://basvuruizleme.online/84115929734j0cxp.pdf
    • http://itnegozio.info/which_book_is_best_for_ethics_integrity_and_aptitude_for_upsc91rb7.pdf
    • http://ig-copyrightnotice.com/jasiparesekolopiyeuio.pdf
    • https://cdn.sqhk.co/vixukose/cifahin/simpleplanes_flight_simulator.pdf
    • https://kevigedevuk.weebly.com/uploads/1/3/1/4/131438682/2900588.pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/vowaxubine-nalumobidulanaw-sadalilu.pdf
    • https://cdn.sqhk.co/mixaluwekitu/Aidjgha/piano_tiles_game_with_anime_songs.pdf
    • http://xtw2.club/hpu_b._ed_admission_form_2019135v0.pdf
    • https://static.s123-cdn-static.com/uploads/4503035/normal_5feea6a1f0aa2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xoxozuzupa.rf.gd/kexuwatirufezukaxov.pdf
    • http://fefezaw.rf.gd/86870136578.pdf
    • http://pilevujomeludo.rf.gd/what_is_navy_necc.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfac.bin
82e7a26d015bc63db4e5c1e6377a4341497159827930a87fcf9d2fc41b4b9de5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAC 4948 bytes
font_01_sfnt_off0000f0a6.bin
fe01b57d965b7b2c58855e019093288c8c6d462243ade2fe2baff3a574a9cb79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A6 10852 bytes

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