Malicious PDF — malware analysis report

Static analysis result for SHA-256 b441a491fc029228…

MALICIOUS

PDF

84.5 KB Created: 2021-04-01 06:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c09e7ca7762a2672504b91809c5a7491 SHA-1: 0d393bed842023dc050481a960cfe26c5741f68a SHA-256: b441a491fc0292283ced0e96da971ba398624609b52a474363241cb0898a084c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs, with a significant portion pointing to disposable hosting, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of external URIs and the link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=2002+vw+passat+owners+manual+pdf PDF link annotation
    • http://bugarul.22web.org/54049094240.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481820/normal_602c84d6cca71.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/xikiwifapojekox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388619/normal_6034251cb9d85.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/30254195307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_6026d3e701c6d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tisudaxutuz.epizy.com/shark_iron_g1468_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d34d78b-2335-455b-8d57-e0d388b74486/what_is_the_natural_rate_of_unemployment_quizlet.pdfIn PDF document text
    • http://puwojewemuxa.epizy.com/kariwatokolitulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6251f38a-91d4-4d1f-aea7-eb4b8dbd2018/central_route_of_persuasion_psychology.pdfIn PDF document text
    • http://sawujasasit.epizy.com/kawedorob.pdfIn PDF document text
    • http://rozepof.rf.gd/accord_de_paris_sur_le_climat.pdfIn PDF document text
    • http://degevojorak.myartsonline.com/the_norns_in_old_norse_mythology.pdfIn PDF document text
    • http://tamexajifosu.epizy.com/3502625207.pdfIn PDF document text
    • http://finedati.epizy.com/61628255703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33238120-1fff-4394-9da7-ac138b7f0f7f/what_are_static_and_dynamic_systems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/819de6f0-6a39-4aa3-ac93-684584b2e8c0/honda_eu3000is_generator_service_manual.pdfIn PDF document text
    • http://gomanezobovo.rf.gd/vuvakisuzom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507631e8-5e9d-4eab-98b0-841aa9cabc77/grade_2_spelling_words_ontario.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f72a0b6-34e6-4c92-8ad3-7f9820cd8fd9/guvebefazibizatukam.pdfIn PDF document text
    • http://dasilumenuf.rf.gd/topabijewodit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f09d5426-0481-47c5-bf57-342dc17c6f62/how_to_read_arabic_words.pdfIn PDF document text
    • http://tuwafexom.epizy.com/cheap_android_phones_to_buy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4000d828-124b-410f-ad72-ff7315ea0ae9/cells_alive_worksheet_answer_key_free.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF491 5516 bytes
SHA-256: 44e000f488f4501fe763a40ff2b184e5ad3c879ac1c0586a97f521a9e91c371b
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 12304 bytes
SHA-256: 9f5eda43d9dd53e51cb89782854838ee743eb80a42a0dd120ba1dfdde404d146
font_02_sfnt_off00012f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F25 16076 bytes
SHA-256: dffadf9df6cbf5a60d57fd1e1b48b3ad2afc4c8cd42d19f42a3eb74df09620b5