Malicious PDF — malware analysis report

Static analysis result for SHA-256 97fffa3c39968968…

MALICIOUS

PDF

82.4 KB Created: 2021-03-26 01:22:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf1f639b868020925c9d40532c35e0a SHA-1: 2a9d1cfe4f022e35d19bca87797bdbe5b8762f1a SHA-256: 97fffa3c399689683b2d5df434e5a97ab023777b351fead91dadf81b3605c2de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable domains, with one URL containing a 'strik' parameter suggesting a malicious intent. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary threat appears to be the redirection to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • 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://vilenefex.ru/strik?utm_term=what+is+shared+knowledge+tok
    • https://cdn.sqhk.co/dodufiruw/haibia9/28079581726.pdf
    • http://edarudost.online/hunter_s_star_quilt_patternjbf8n.pdf
    • http://creditscorecard.info/who_is_lucifers_motherr36h1.pdf
    • http://sitajejo.22web.org/how_to_do_self_adhesive_wallpaper.pdf
    • http://tuzojexis.mypressonline.com/89035884897.pdf
    • http://creditreportfast.info/tft_items_cheat_sheet_9._22izoix.pdf
    • https://cdn.sqhk.co/vejanozugova/iigdggS/boat_bill_of_sale_form_washington_state.pdf
    • https://cdn-cms.f-static.net/uploads/4369343/normal_602681854e4cc.pdf
    • https://cdn-cms.f-static.net/uploads/4455196/normal_603616756da4e.pdf
    • https://cdn.sqhk.co/moturalogupe/hejhRvo/69472231368.pdf
    • https://static.s123-cdn-static.com/uploads/4418991/normal_5fca5d463e341.pdf
    • http://xsafak.com/pefamakunovufuxu0yp.pdf
    • https://cdn-cms.f-static.net/uploads/4466657/normal_600a3b4c1e282.pdf
    • http://xufuzema.sportsontheweb.net/31064857852.pdf
    • https://cdn-cms.f-static.net/uploads/4394060/normal_6015943b9d78d.pdf
    • http://lodomujimujug.mywebcommunity.org/cricket_score_sheet_format.pdf
    • https://cdn.sqhk.co/fikubife/Izyjdjj/89799893807.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_33cbfc9811a647a89cf4b4c86daa321d.pdf?index=true
    • http://judedinem.epizy.com/pancreas_endocrino_ou_exocrino.pdf
    • http://bitujiduruv.myartsonline.com/wipaxaruvavuwaraz.pdf
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_5935946bdeb24150a0c8e672ecb7140f.pdf?index=true
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_f287da51c51b4815ae3909230fa32e4f.pdf?index=true
    • https://6f1239e7-da96-47bf-8adb-22d47a96a9da.filesusr.com/ugd/bb5a15_9fa5ed4f73f946109daa53c20aba7c81.pdf?index=true
    • http://namepafubi.atwebpages.com/characteristics_of_democratic_leadership_style.pdf
    • http://joxepivebafugig.epizy.com/xanira.pdf
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_d0f7f7b43fe543d382f1f6bde872e4a1.pdf?index=true
    • 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_off000102ae.bin
cb89c47276bc714f50c4d41c1eafaec289c6af023d98293a4403080e4903ba4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102AE 5256 bytes
font_01_sfnt_off0001149f.bin
814b0bca27ea41097cd75c605b8c4c48e8db8f5cf198bcf62700f87f26c081dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 12108 bytes

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