Malicious PDF — malware analysis report

Static analysis result for SHA-256 975bb33600cead7d…

MALICIOUS

PDF

72.5 KB Created: 2021-05-18 19:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 1de8a3dcf18b7c9e6584e46b52e7ce61 SHA-1: df4cfe1a554f4c30f2d0b1f765a2a2d693565100 SHA-256: 975bb33600cead7dfce82ad54381a2408f6f4d621da661727c70c74b0b62fa4b
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a suspicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URL is the primary indicator of compromise, suggesting the document is a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+to+bleach+hair+using+splat PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365660/normal_5fc9e4a1bd1f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452385/normal_605204291bb57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f501ec-5c0b-46da-a228-c82d6856f081/be_able_to_exercises_multiple_choice_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db14ef2-0f19-4fbe-b896-d99af7de192a/what_should_a_college_admission_essay_look_like.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea39f9a9-f02f-4731-842d-a974d6da75cf/what_charger_does_a_hp_laptop_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aae495a-4570-48b5-b42a-0de81addbeb5/verbos_regulares_e_irregulares_en_ingles_y_espaol_en_presente_y_pasado.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/caller_name_speaker_announcer_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a41af0f9-3322-4a5b-a92e-3aef37720508/pipe_saddle_layout_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/deformed_hands_rheumatoid_arthritis.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/manual_capsule_filling_machine_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdf73ec-68ac-46e5-8916-614c909903f9/93924317841.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b21ef356-d0bb-477d-a4d9-8cd829404ab6/a_perfect_union_of_contrary_things_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/brisbane_tv_guide_free-_to-_air_tonight.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782c677d-c569-4c4e-8715-a12c26c23a07/fufotovibetisuxojeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6be86739-f00a-4ae5-96bc-c62300dc262d/how_to_use_dentek_professional_fit_dental_guard.pdfIn PDF document text
    • https://s3.amazonaws.com/wamatasamegu/kokajekuneziwekexu.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/lewewogekibule.pdfIn PDF document text
    • https://s3.amazonaws.com/pirosisob/14632566452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d4ed8c-abb3-4b4c-9b34-3216cf3e3a91/kitchenaid_professional_600_stand_mixer_6_quart.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 5388 bytes
SHA-256: 9e74e19bdbf69227f229c42a27ca1c91ce91f2415118f592c29034fd05cd0cb2
font_01_sfnt_off0000f015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF015 10848 bytes
SHA-256: d413a68740dba67baa124a93189744c3b5a1576c70e8febff485fec6e712230a

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