Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90cefac3e5d483f…

MALICIOUS

PDF

81.7 KB Created: 2021-03-10 23:11:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7173d25fccf3a754d7d07a266e7a5200 SHA-1: ce3d9d4e4366d54c7b1d7a68cdd97ccf960c386a SHA-256: a90cefac3e5d483f3fb773f42052c9334fda648b53c31983f3d7da00bc3a1ef4
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains and are associated with link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/123?utm_term=fb+page+cover+photo+template PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475989/normal_6036fcf6e3bbf.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/RjtibCi/faxeliwudek.pdfIn PDF document text
    • https://cdn.sqhk.co/vedukosamo/dCjbHJ8/talking_kitty_dunjay.pdfIn PDF document text
    • http://swast-group.website/viva_bingo_slots_free_casinou3rq2.pdfIn PDF document text
    • http://starkrobotics.org/walmart_bcg_matrixzlkac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481673/normal_6022bf46a8189.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/mGLg8jh/clean_virus_iphone_x.pdfIn PDF document text
    • http://edayafar.xyz/runovx3vsi.pdfIn PDF document text
    • http://tehnotop.site/disturbed_sleep_pattern_nursing_care_planayamg.pdfIn PDF document text
    • http://biomaniks.website/338226559104irbj.pdfIn PDF document text
    • http://ulekschool.online/4673050030ejalw.pdfIn PDF document text
    • http://websecurer.tech/41904889134inuvl.pdfIn PDF document text
    • https://cdn.sqhk.co/lusesito/sgj1iaO/lamazaz.pdfIn PDF document text
    • http://moviesaddaa.online/how_to_write_a_smart_goal_examplenp499.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/13084cfd-3563-4706-9b70-d4ad2a00ecf7/lurafitapeneji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4091a4a3-f156-42ff-91c4-dc75af7e8349/razuderigiwikaloliponewu.pdfIn PDF document text
    • http://poxelisenaxoxig.epizy.com/proper_mod_load_order_skyrim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8251c1e-efad-4925-85ce-983f7ad5b164/six_of_crows_netflix_series_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997bf7c1-47d1-4d93-96e3-34654127fc63/gagekinip.pdfIn PDF document text
    • http://tumosavosaruw.rf.gd/australian_bartenders_guide_to_cocktails.pdfIn PDF document text
    • http://vemusimovoxodan.rf.gd/46622156146.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_off0000f605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF605 4960 bytes
SHA-256: 257fcf44f9812fa881f491fef78aa51407cf3fe9bdf40a6e2d2077909f6b932b
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 10496 bytes
SHA-256: 054ff2329e49ce97346885fb2d3b04bc556e45109565fcdc5422de370a7f3549
font_02_sfnt_off00012adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADC 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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