Malicious PDF — malware analysis report

Static analysis result for SHA-256 39cec17f0304afae…

MALICIOUS

PDF

84.2 KB Created: 2021-03-14 05:24:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2b8c10614706e6fb09a86123f3781aa4 SHA-1: 1908ab201b21b88ba11ae44ba3f0d3a854c4b4a0 SHA-256: 39cec17f0304afae7022cade9fa86ee1cd3cd6553ffce1aa5a164782f028af8f
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, with specific heuristics indicating it's a link farm on disposable hosting. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs are consistent with attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/award?keyword=frequency+dictionary+of+british+english+pdf PDF link annotation
    • http://brightshopbg.xyz/wilol3d44w.pdfIn PDF document text
    • http://tideparipawovu.mygamesonline.org/75082311086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_60435080351ba.pdfIn PDF document text
    • http://xuxetosufuzo.getenjoyment.net/62834801338.pdfIn PDF document text
    • http://burrrhey.tech/68649928621bwyu6.pdfIn PDF document text
    • http://helplnstagramcontact6088757.com/gatativogunusc037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460680/normal_603d6084234c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444100/normal_5fe86c6787a82.pdfIn PDF document text
    • http://deromgroup.com/kidde_hardwire_smoke_detector_with_9v_battery_backup_6-pack3m5ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402481/normal_60150e134dce9.pdfIn PDF document text
    • http://pegejoruvufiron.sportsontheweb.net/5487527397.pdfIn PDF document text
    • http://tesocoin.online/laxuxudotavalumg4rvn.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://gitogopafo.epizy.com/fujojutaromejugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2b5810-1094-47c7-a78e-3d73a2e9fb70/wefaguxujazifolubuliduju.pdfIn PDF document text
    • http://benipipopapil.rf.gd/are_verizon_phones_compatible_with_straight_talk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0eec02-3ecd-4e99-981c-55dc3845a18d/dosidufudisexisiwusimepu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3adeb5-d860-40ef-8a32-945f3b52587d/27763045906.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/39560020006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d31af43b-505a-481b-bb01-e4be1359320f/beren_and_luthien_pictures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/884b624f-125c-43cc-8ced-c6b7db71309e/why_wont_the_volume_work_on_my_remote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb7b21a-3959-4cfc-8309-f4e52c4e2518/calorie_chart_for_vegetables_and_fruits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7ac6d68-0a9a-48ce-8fc3-05762f127224/reading_like_a_writer_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c30ce5c-58f1-476d-8193-5f1112d3a0f0/57969413675.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/how_to_install_kenmore_oven_heating_element.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_off0000fc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0C 5624 bytes
SHA-256: a3b08cf58aed54179beea9c662c3fc20ffdaffcd62d8d7e0759ddb30a8ec9cab
font_01_sfnt_off00010f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F19 11104 bytes
SHA-256: 019c9f76bdbca11d83815b87cf4a3b7b938ade73d4fc7852f3035a3ab8dc9e65
font_02_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71