Malicious PDF — malware analysis report

Static analysis result for SHA-256 70679f447ae88e62…

MALICIOUS

PDF

70.5 KB Created: 2021-03-08 05:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 27fa8e49a18d36acc26031994a68d159 SHA-1: 708a7849fd0bfd8a6a42e9292b0cf0cb19c7c6d1 SHA-256: 70679f447ae88e6280ac55022994241e7eb01d32752c70f82911b7044f36290a
104 Risk Score

Malware Insights

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

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains an external URI pointing to a suspicious domain, and the document body, though truncated, suggests a lure related to 'preamble scramble answers'. The presence of embedded URLs and the overall context indicate an attempt to trick the user into downloading a payload, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/wix?keyword=preamble+scramble+answers PDF link annotation
    • http://dumubemajizukov.medianewsonline.com/2016_ap_biology_free_response_answers_question_8.pdfIn PDF document text
    • https://cdn.sqhk.co/gusisezepemu/iDiehie/all_video_converter_apk_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/junulevi/96hfIpL/78306228667.pdfIn PDF document text
    • https://cdn.sqhk.co/moxibusas/jrjjMTX/72777238595.pdfIn PDF document text
    • http://inscarusa.info/kajulawezakalatarepxswie.pdfIn PDF document text
    • http://bighome.space/mitosis_in_plant_cells_lab_28_answersjy1gz.pdfIn PDF document text
    • http://fulokixowo.scienceontheweb.net/how_much_is_a_carburetor_for_a_craftsman_riding_lawn_mower.pdfIn PDF document text
    • http://pogadai.xyz/tuxuzojemabax3o7np.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/SzDhgja/michigan_governor_election_2020_candidates.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/gugiqKi/pufugasisagogibekisojaxoz.pdfIn PDF document text
    • http://veselutut.mywebcommunity.org/wakamosaxamugikamafi.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/bc34ce6a-3e48-41e5-b18a-381d1c1bbbed/bepiwosexudozame.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/lemefurewewadufajubexo.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/lenewit.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/mufuridugovafik.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/20550831013.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/can_i_study_cfa_in_3_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec70acd-bbaf-49cc-b243-f10f5ce59adf/rimatazulorirokosirug.pdfIn PDF document text
    • http://kikukuvikato.myartsonline.com/sitetojulusamalob.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/fazubamelasenatoli.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/where_to_donate_womens_clothes_melbourne.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_off0000d912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD912 5180 bytes
SHA-256: 307d82479354a66d6fae680c97bf98a5f5a02d7915b39507c27fbcbb962a5853
font_01_sfnt_off0000eaa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA3 10076 bytes
SHA-256: a16e5cce5b8af7abcb7bd3a7b78eec12680c2904720eeb3cddaa3946d33a00bc

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