Malicious PDF — malware analysis report

Static analysis result for SHA-256 115e25ca92ae2b9f…

MALICIOUS

PDF

75.8 KB Created: 2021-03-06 02:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cf592179b2337508a1602837985a6ece SHA-1: 9ef6d84cb6e80d601ed34178c283e053a29de572 SHA-256: 115e25ca92ae2b9ff700e8d0c01b65301501cc737304cc962744f29c7b84de15
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the sheer volume of external links indicate an attempt to redirect users to potentially malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://soxebez.ru/123?utm_term=how+do+you+clean+the+filter+on+a+samsung+vrt+washing+machine PDF link annotation
    • http://puralivivupose.iblogger.org/carriers_movie_in_tamil.pdfIn PDF document text
    • https://cdn.sqhk.co/fukefipemuw/ibicsig/66279300394.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/hahgvhT/slither._io_hacked_unblocked_games.pdfIn PDF document text
    • http://selitir.iblogger.org/george_vs_george_book.pdfIn PDF document text
    • http://fb-ig-copyright.com/hearts_of_darkness_marvelcv3wp.pdfIn PDF document text
    • http://montana-media.com/a_glossary_of_literary_terms4xsuf.pdfIn PDF document text
    • http://lefewibek.iblogger.org/65329300408.pdfIn PDF document text
    • http://copyright-help-report.com/52890448089mxnbl.pdfIn PDF document text
    • http://lozhobelir.space/infected_cut_in_corner_of_mouth4ys01.pdfIn PDF document text
    • https://cdn.sqhk.co/letaziseb/ggIjbYS/xawagagesajatojok.pdfIn PDF document text
    • https://cdn.sqhk.co/tunuviju/EhcRjci/mumebunikagu.pdfIn PDF document text
    • http://danivufulof.iblogger.org/20654253306.pdfIn PDF document text
    • https://cdn.sqhk.co/tebefaravuz/hjdGahg/vuwubinepozuxidoxenur.pdfIn PDF document text
    • https://cdn.sqhk.co/tezofugowura/KDegfhh/cake_baking_games_for_pc.pdfIn PDF document text
    • http://abzac.me/how_to_use_ps_gold_headset_on_xbox_onex5mnz.pdfIn PDF document text
    • http://zebakabum.iblogger.org/1st_birthday_invitation_card_templates_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gexaforagugozen.rf.gd/zibiw.pdfIn PDF document text
    • http://solilajikabode.rf.gd/the_climb_anatoli_boukreev.pdfIn PDF document text
    • http://nerelikeg.epizy.com/gwent_arena_guide.pdfIn PDF document text
    • http://riwefub.epizy.com/49560992299.pdfIn PDF document text
    • http://jagazuzigi.epizy.com/3775568989.pdfIn PDF document text
    • http://kezazole.epizy.com/33451429998.pdfIn PDF document text
    • http://patabajisof.epizy.com/16658616269.pdfIn PDF document text
    • http://kidogip.epizy.com/quick_heal_antivirus_for_android_phone.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_off0000ea4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4F 5648 bytes
SHA-256: 8e0d27edaa8583fb96faf333df3adafcf415f7b24d35988e3a1510c994dd1565
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 10412 bytes
SHA-256: f6ce2e0a724a4680eb5e65f4991e4a4ce7bfa0a124c93f6ce96b84077c52c536

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