Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0279c352a5c49e…

MALICIOUS

PDF

73.7 KB Created: 2021-04-07 05:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d5f7aeb9b2e543c2de6e265a0ae46538 SHA-1: 6782cbbcb5d41f7c7913902e13a6322d06e76637 SHA-256: fa0279c352a5c49ef8f513907a4bbc444d5077f7460bc0a6a9e3f4a9117adf85
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'dafemum.ru'. This URL is also listed as an embedded URL and is associated with phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/123?utm_term=bootstrap+4+form+validation+has-+error In PDF document text
    • https://cdn-cms.f-static.net/uploads/4450734/normal_5fd86e4e72cb9.pdfIn PDF document text
    • https://cdn.sqhk.co/rawavuzom/Uibibhd/republique_francaise_wikipedia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470221/normal_6036c1c9562a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403959/normal_602ee2f57d2df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406776/normal_602ad6d325169.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/hjidic4/resulet.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/yH3fido/minecraft_brewing_guide_1._12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503533/normal_60396157d7366.pdfIn PDF document text
    • https://cdn.sqhk.co/liregevo/iejcggD/resort_tycoon_hotel_simulation_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxixixixi/LhdC4if/zopukuruzutadurofibafu.pdfIn PDF document text
    • https://cdn.sqhk.co/jusulikipe/Cibashg/axis_football_league_2014_learn4good.pdfIn PDF document text
    • https://cdn.sqhk.co/timadupak/jfjaDgg/cbse_class_12_topper_2019_marksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/JwqhaTa/76228108037.pdfIn PDF document text
    • http://vejofewi.iblogger.org/free_able_resume_templates_for_microsoft_word.pdfIn PDF document text
    • https://cdn.sqhk.co/nanijamu/jxm2Whj/hotline_bling_bachata_remix.pdfIn PDF document text
    • https://cdn.sqhk.co/zapiseniw/jFgvWOU/ziwixusedojibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e0ba35-3f68-4111-9ec4-774e6ed0099c/rewomowetumawesimemitaw.pdfIn PDF document text
    • http://vomuvipovaridus.rf.gd/supilufubobufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8741aaa4-278d-4df2-b333-0ef2975cce43/sbs_2011_standard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b3ca73-1b82-4462-a0a8-9a7a55ad7eee/philips_norelco_bodygroom_series_7000_charger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c2a37d-fffa-4e68-8c79-4fb4cc0cbe38/zexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6495d2b9-face-4c3a-8e65-120ae1ebb853/64446665139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc82eb10-7a98-47fa-87b1-12727e74ddc2/cuenta_conmigo_pelcula_completa_en_espaol_latino_pelisplus.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_off0000e203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE203 5512 bytes
SHA-256: d07e2fefbb4186127ad8b6df5e9d79c18218581d6720e50d64aac7566a8462aa
font_01_sfnt_off0000f4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 10600 bytes
SHA-256: f30f31988d8ee28475ef28945bf7e9894653b5e64b82423066e290451a88209f