Malicious PDF — malware analysis report

Static analysis result for SHA-256 099e276f0a609e60…

MALICIOUS

PDF

68.4 KB Created: 2021-02-28 23:31:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b687b4b66d2f4670250bc67cc974c199 SHA-1: a9efa5f2d6789738db28a73b04d5b4983a82943f SHA-256: 099e276f0a609e60d713352015b31f5a5104b40056f33c7d90acb26aae457580
166 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains multiple suspicious links, including one that is invisible and points to a domain associated with phishing lures. The document body, though heavily obfuscated, appears to be a lure related to 'comparing and scaling ace answers investigation 3', suggesting a phishing pretext. No scripts were extracted, but the presence of external URIs and the overall detection profile indicate a likely attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/wix?keyword=comparing+and+scaling+ace+answers+investigation+3 PDF link annotation
    • http://peuer.xyz/biblio_mathimatika_a_gymnasioux7ea9.pdfIn PDF document text
    • https://fenazimo.weebly.com/uploads/1/3/4/4/134437137/feaf9d3340118.pdfIn PDF document text
    • http://workmonster.net/zusizuzowitazi80qj9.pdfIn PDF document text
    • http://bizifawidipegib.iblogger.org/dezobelapiwipanojiw.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/vadikebabivuzivijiza.pdfIn PDF document text
    • http://shoop-fk.ru/bahubali_movie_dhivara_song_ringtonez767a.pdfIn PDF document text
    • http://lekujajivuvire.iblogger.org/lyman_reloading_press_kits.pdfIn PDF document text
    • http://kowezuzapine.66ghz.com/berita_thandolwethu_mp4.pdfIn PDF document text
    • http://xakavewazoxejef.22web.org/craftsman_radial_arm_saw_safety_kit_recall_and_retrofit.pdfIn PDF document text
    • http://xekinivafu.iblogger.org/13528146653.pdfIn PDF document text
    • http://loginwithfb.site/vadexopuwlzf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinerulekivu.rf.gd/45230055180.pdfIn PDF document text
    • http://fevidubigozexa.rf.gd/anbe_anbe_surya_song_free.pdfIn PDF document text
    • http://zetesapoxus.epizy.com/best_android_games_2018_google_play.pdfIn PDF document text
    • http://vebowowibo.rf.gd/julian_date_calendar_for_year_2021.pdfIn PDF document text
    • http://mukofusakox.rf.gd/pentair_whisperflo_1.5_hp.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/55600486262.pdfIn PDF document text
    • http://namidonom.epizy.com/wugovuzuzoturotodozofi.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_off0000cfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD9 5612 bytes
SHA-256: aa9eb086950edcfe4951eaa2333253bb6fb1ce1280aefbba222eeb1dc50d7a53
font_01_sfnt_off0000e2e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E9 9812 bytes
SHA-256: 06e894c25779151d858a909986cda7a7bbf1519562b6f6d32bf6d16019ef7ade

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