Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f49af64d4ee9061…

MALICIOUS

PDF

89.1 KB Created: 2021-03-06 13:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d0a8ac5749bc5056f39ea72c4e123c7d SHA-1: 830a73fd46ca6913a3f3e22f1cdfdc5814e9b672 SHA-256: 6f49af64d4ee906168eae4ddf178650d9d938ca2bc123265607cdb888c64bb8e
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically referencing 'neopost postage machine' and pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a secondary payload. The PDF structure and embedded links suggest it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://botokaw.ru/award?keyword=how+to+use+neopost+postage+machine PDF link annotation
    • http://mebets.xyz/weider_ultimate_body_works_exercises_guideqq2sj.pdfIn PDF document text
    • https://kuvugelovusilu.weebly.com/uploads/1/3/4/4/134437140/9184464.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/29ed348b1.pdfIn PDF document text
    • http://4gusevshop.space/bobukoruk0ex3r.pdfIn PDF document text
    • http://fullstacket.online/daxidinogotamizixudam6aka0.pdfIn PDF document text
    • http://blancly.xyz/87798786472uccmu.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/jolebamig_wifutesina.pdfIn PDF document text
    • https://zugivosiruboni.weebly.com/uploads/1/3/1/8/131858419/morazapebab.pdfIn PDF document text
    • http://juxowupekabaf.mygamesonline.org/craftsman_evolv_table_saw_rip_fence.pdfIn PDF document text
    • http://thiswaytovogue.com/vebolutalovajevusojuvapoiuvl2.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/0559ee74a2.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
    • https://uploads.strikinglycdn.com/files/fc50bdd9-d833-4369-b3fa-3329ac211be1/rerowu.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/hp_p2035n_printer_driver_for_windows_10_64_bit.pdfIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_8c4143fe65204dc1a40bf69785deb4d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/195e7990-62fc-4c4b-b6fe-4edec8712573/34420869785.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/how_much_can_a_content_writer_make.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/cetoacidosis_diabetica_urgencias.pdfIn PDF document text
    • http://lawesiwewif.onlinewebshop.net/magic_tree_house_book_series_age_group.pdfIn PDF document text
    • https://s3.amazonaws.com/jefazaxal/l5r_3rd_edition_character_sheet.pdfIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_f12c54cb154c473b8d634402f37c56ee.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ae121a1-cbc0-4fc8-8376-226485012c88/lowonewemakudikowo.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/kitoravutunadep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28ce0040-12fa-4f72-bb94-3f7b935d36a6/nosoxotatavanolupawupewos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001116e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116E 5152 bytes
SHA-256: 23f426dd2362e4feb95638cba15d273ea58c0cf375aac3cf19ca8004e8fe1d15
font_01_sfnt_off000122dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DC 11024 bytes
SHA-256: 634b3e8bdafa015e7e38b0c269b8be8846eaf33f64bf46febf707dc4085af643
font_02_sfnt_off0001489a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1489A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361