Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d51b31389aff441…

MALICIOUS

PDF

90.4 KB Created: 2021-04-27 11:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 09bc55e003377c6d269ae5240a282156 SHA-1: dff2e67a4ced50244219edd8098cce6e8683c1dc SHA-256: 8d51b31389aff441cf0218a25182f943c69b56bf9820908d0ecf09f0ee361775
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/strik?utm_term=how+to+use+a+cuisinart+convection+bread+maker PDF link annotation
    • http://xudeduda.iblogger.org/22366269392.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/0aHgjIu/start_page_chrome_android.pdfIn PDF document text
    • http://nivanugifur.iblogger.org/niwodujosemopiboxeserebol.pdfIn PDF document text
    • https://cdn.sqhk.co/gasukatebu/jbGhihi/f1_kubica_arm.pdfIn PDF document text
    • http://shtampshop.ru/how_to_study_physics_for_neet_2020ymvls.pdfIn PDF document text
    • https://cdn.sqhk.co/wosipuvetot/gf3XIje/84044585253.pdfIn PDF document text
    • http://meblik.su/telecaster_guitar_plansbw7tn.pdfIn PDF document text
    • https://cdn.sqhk.co/suwojixuwebi/jivRgh7/covid_testing_marketplace_mall_champaign_illinois.pdfIn PDF document text
    • http://nosatines.mypressonline.com/baumgarten_aesthetica.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://793776f3-68b4-44d3-947a-596ce2c6f652.filesusr.com/ugd/4e977a_e6c934c5a9384151800942099bd4eda3.pdf?index=trueIn PDF document text
    • http://tuwafexom.epizy.com/92263355118.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_ac4a5760bc1a4eae997eeb2d0ef77403.pdf?index=trueIn PDF document text
    • http://tagogegipuz.epizy.com/65967878328.pdfIn PDF document text
    • http://sidefometelibib.rf.gd/antifouling_convention.pdfIn PDF document text
    • http://bavevex.onlinewebshop.net/50672135223.pdfIn PDF document text
    • http://wovogaxix.epizy.com/puwoselu.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_d983b19f90a04443a57b4d7ec7270422.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_0a885be592c445b1b032287cd33695b5.pdf?index=trueIn PDF document text
    • https://528a8416-53f4-4693-bcf0-540471887af1.filesusr.com/ugd/c3aa89_256a5c014fb34f7c8ff7f1e35dea02a4.pdf?index=trueIn PDF document text
    • http://befokube.rf.gd/information_technology_university.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_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 5372 bytes
SHA-256: fbca6a2b5fa56f7557754fe7eea107e37ccca4ad49e0916a20da93c34857382c
font_01_sfnt_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 12072 bytes
SHA-256: 118cb87e11c88078c23bb9160b235623980e800c0250359aa0183b65d2dbb0e8

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