Malicious PDF — malware analysis report

Static analysis result for SHA-256 163fdc70c40d4a36…

MALICIOUS

PDF

78.2 KB Created: 2021-03-29 21:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 322b8302f1d410c7302007bdb62e678f SHA-1: 24199f949c116166fbe2347364f191954aa47d85 SHA-256: 163fdc70c40d4a3643db31a522349aa39574d15a45ad0d624e881420e24ee0f0
126 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or suspicious platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

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
  • 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://botokaw.ru/award?keyword=attachment+theory+test+pdf PDF link annotation
    • http://burutevopu.iblogger.org/simplemente_enamorados_mary_balogh_gratis.pdfIn PDF document text
    • http://ponexikid.22web.org/53058726467.pdfIn PDF document text
    • http://organic100.fun/cara_backup_whatsapp_android_to_iphone558zz.pdfIn PDF document text
    • http://iminn.ru/bhangra_empire_2009_videohp6tg.pdfIn PDF document text
    • http://icub.tech/what_are_the_medical_requirements_to_join_the_national_guardspk4d.pdfIn PDF document text
    • http://devlp.club/resultant_forces_worksheet_answerszk2iw.pdfIn PDF document text
    • https://pugewolusaw.weebly.com/uploads/1/3/1/4/131453132/fafewedifilitaz_jizilefale_wizikexo_jatize.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/6e04c940c4.pdfIn PDF document text
    • https://mexavabawidusa.weebly.com/uploads/1/3/4/3/134375000/dedadotagagus_rolev_mizaz.pdfIn PDF document text
    • https://fefolidagemilo.weebly.com/uploads/1/3/1/4/131453124/7170203.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fojisar.rf.gd/5863312534.pdfIn PDF document text
    • http://bajofot.epizy.com/common_and_proper_nouns_worksheets_class_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb71020-72be-4194-9052-4c2ca130f09e/pentax_k1_vs_k3ii_image_quality.pdfIn PDF document text
    • http://kuxiguzemafuj.rf.gd/68882368642.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/952acbc7-3c58-4ef8-93d0-206d02302fe4/omr_ocr_micr_are_all_types_of.pdfIn PDF document text
    • http://tufebogepamik.rf.gd/rovovovizovamomanos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97e15a9-d447-4cf9-a882-5bf8c4122fc9/nuneme.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_b09e1e0ff1664ae0a8137196ca62224f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8826ff1-1c95-4241-a0b5-5494b09609f8/motorola_surfboard_sb5100_troubleshooting.pdfIn PDF document text
    • http://lorabedujeweb.epizy.com/common_english_sentences_used_in_schools.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_edd40f8921cf4e16a46b4b09cc9034c1.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 5192 bytes
SHA-256: 737733b951cea0aa481bed5fe2e4d01c6a2197a1e1b88698652df23d91fd89e4
font_01_sfnt_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10816 bytes
SHA-256: 00fd195611ec1c68a8521fd69d07ee0b93d529b169be492178ddf1e16ea851cc
font_02_sfnt_off00011dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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