Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc61ad16f9747de…

MALICIOUS

PDF

80.6 KB Created: 2021-03-29 03:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 6c55064e5faa921861e43a4271ab171b SHA-1: efc4626454d6e7db0aa5999adc312c95533d0dc8 SHA-256: 9dc61ad16f9747de7e243e7919db60f846638b03b32755ec21a1ba0cc4c8ef64
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary suspicious URL pointing to a domain associated with phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially corrupted, suggests a lure related to a 'stem career interest survey'. The presence of external URIs and a link farm heuristic further supports the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/award?keyword=stem+career+interest+survey+pdf PDF link annotation
    • https://bufetokarad.weebly.com/uploads/1/3/4/0/134096279/zenob.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/e2UHhau/monster_truck_racing.pdfIn PDF document text
    • https://nemabofafuz.weebly.com/uploads/1/3/5/3/135389169/joritixafited.pdfIn PDF document text
    • https://cdn.sqhk.co/vexavudakepa/gJVhc2k/motorcycle_wallpaper_for_iphone_6s_gold.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/jbidFCd/zunebevomoxelunixijavaz.pdfIn PDF document text
    • http://jobopenufa.iblogger.org/auto_body_repair_technology_4th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/jfPgifF/4runner_toyota_price.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/Hibjjuh/15646742028.pdfIn PDF document text
    • http://talemine.getenjoyment.net/gomukarabukowexutupulifu.pdfIn PDF document text
    • http://fagumawegoleleb.mypressonline.com/job_interview_questions_and_answers_for_engineers.pdfIn PDF document text
    • https://zadejafiton.weebly.com/uploads/1/3/0/8/130813032/vutifo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xofuzugavup.epizy.com/capites_da_areia_completo.pdfIn PDF document text
    • https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_529e735b2e2e470ca5d679d883da62a1.pdf?index=trueIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_920ed9ca9bf8486abaab84073afea7ea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fa2c499-52ed-42e8-8588-ba3d2dfe7d21/13880503217.pdfIn PDF document text
    • http://lenepozomewu.epizy.com/35227617294.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a7f710d-baab-4d21-8060-ca4b8d910511/2010_proto_rail_manual.pdfIn PDF document text
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_f8290140383347ec9cb86fe5c95a3bc1.pdf?index=trueIn PDF document text
    • http://jopinewo.epizy.com/why_is_twc_not_answering_calls.pdfIn PDF document text
    • http://wepikupovug.myartsonline.com/septic_arthritis_treatment_guidelines.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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5536 bytes
SHA-256: c45e6d4734712680d39f3934549c79841597ebf502f7208cb1a85aec67a2cbd6
font_01_sfnt_off00010ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB8 11952 bytes
SHA-256: 934a1a983fdda686381a77b3d5ea0942165a8783ae30f5d731d2d196cb6810cb

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