Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b01f9d488280b3…

MALICIOUS

PDF

73.8 KB Created: 2021-03-11 02:14:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: dc8f2861fbb3faf991eff782f2ad3cad SHA-1: 9d38752a103b90d7e2fff2abee8182495e2b8812 SHA-256: 74b01f9d488280b32635f12cc63b9dd2d8d4c2fd50188d78b58b70ca83d65e58
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' heuristics. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, which is a common tactic for phishing or malware delivery. The presence of external URIs strongly suggests an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wix?keyword=fish+amphibians+and+reptiles+worksheet+answers PDF link annotation
    • http://obschee.xyz/77472275297vlph5.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/FO8rieK/bitilodi.pdfIn PDF document text
    • http://bloomwithdeanna.com/5520313703738jvd.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/xigjjAq/pegapemimuregagofopuratog.pdfIn PDF document text
    • http://tajavimisafom.22web.org/cryptocurrency_trading_guide_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369307/normal_603c647702fc2.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/Wohcgf3/85588305655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476925/normal_603b7c3b87a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_5fd5fe8044996.pdfIn PDF document text
    • http://abistrans.ru/what_does_this_emoji_mean__from_a_guyzpdir.pdfIn PDF document text
    • http://lynciguest.com/31761776197lyfnm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412584/normal_603c6398e237b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484122/normal_5fec07786a994.pdfIn PDF document text
    • http://vir-tus.com/why_is_my_kenmore_elite_refrigerator_making_noisee3ndj.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/gJjZs4E/used_cars_in_maine_under_7000.pdfIn PDF document text
    • http://dithetsen.xyz/college_soccer_conditioning_program6915c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380076/normal_5ffa71bcb0db0.pdfIn PDF document text
    • http://kopolade.22web.org/korg_sv-1_midi_driver.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feramivo.rf.gd/new_england_patriots_undefeated_season_2015.pdfIn PDF document text
    • http://tejebakaropa.epizy.com/69914734087.pdfIn PDF document text
    • http://ribizotujigotok.rf.gd/would_you_mind_answering_a_question.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 5448 bytes
SHA-256: 38725e7bd0ed1ffa2671d5c981706859e1c92d47ba835eef47f14141c63e09bb
font_01_sfnt_off0000ee33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE33 10460 bytes
SHA-256: cd0e3751cd1a2a5a81da769e29034431f88bcd5e1ff276f799701389e3ade531
font_02_sfnt_off000111e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E5 1736 bytes
SHA-256: 74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d

Open this report in the interactive analyzer, or submit your own file for analysis.