Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35ba4dc0c52578d…

MALICIOUS

PDF

75.2 KB Created: 2021-02-06 15:10:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c4dba88f7370850c9721bc9badd59d86 SHA-1: 61ae11ba254f23a449e5e851f1886d23c22bc8ff SHA-256: e35ba4dc0c52578d11b2d38ec35c53f78887d66f538088c78c785a3d1eca8115
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'jacksth.ru' which is flagged as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded links suggest a social engineering attack.

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://jacksth.ru/aws?utm_term=sheet+music+for+say+something PDF link annotation
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/fadotiromuli.pdfIn PDF document text
    • https://vamekalufigo.weebly.com/uploads/1/3/1/1/131163651/5379501.pdfIn PDF document text
    • http://japadalifu.22web.org/7832445927.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/hjvkV5e/89036815554.pdfIn PDF document text
    • https://dinijituwit.weebly.com/uploads/1/3/1/6/131606252/fc5e6e471f9.pdfIn PDF document text
    • http://newyearshop.site/xactimate_roofing_codes9ozi2.pdfIn PDF document text
    • http://zufunepel.iblogger.org/cheerful_upbeat_music.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/dMIjaij/3715779253.pdfIn PDF document text
    • http://shop-profildoors.ru/berrylook_platform_sandalst45q7.pdfIn PDF document text
    • https://kobivepetere.weebly.com/uploads/1/3/1/8/131871499/f946df727aea00a.pdfIn PDF document text
    • https://cdn.sqhk.co/bipuzojafa/jdiigfs/birthday_cake_decorating_ideas_chocolate.pdfIn PDF document text
    • http://xonajagavasuj.22web.org/training_evaluation_form_template_excel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dofufiri/mafoju.pdfIn PDF document text
    • http://gexazavere.epizy.com/26734375045.pdfIn PDF document text
    • http://widafasamuj.epizy.com/saaho_video_trailer.pdfIn PDF document text
    • http://xuvotawelotito.epizy.com/anna_karenina_movie_dual_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/vivah_movie_song_video_status.pdfIn PDF document text
    • http://waromewozepivo.rf.gd/luzeturofezilosilu.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/perforated_plastic_sheet_canada.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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 5468 bytes
SHA-256: 43dd59ae7203bddffbc740476cc6d31a5f1eb43cc9636b3867fd592cd3eded4e
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 10412 bytes
SHA-256: a9f04d5aee6c930ea07908a9a37852b1f3233cb2826eb26370fb8c0707febcc1

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