Malicious PDF — malware analysis report

Static analysis result for SHA-256 a19bc5d67c2c918e…

MALICIOUS

PDF

73.7 KB Created: 2021-03-21 12:13:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b0555f2d4ea77e0ee0a44c27991bf00d SHA-1: ed363bc3ffedaf00a899d4c6498bed8a1ca1ad1d SHA-256: a19bc5d67c2c918ef3501b3dea495a461088e050316f2793bdf4efc6ee2b1d2b
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's a link farm on disposable hosting. The embedded URL points to a suspicious domain, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/award?keyword=tequila+percussion+ensemble+pdf PDF link annotation
    • http://feedbacrnz.space/k9_mail_spam_filter_aktivierensvkkf.pdfIn PDF document text
    • http://badgesverified.com/minority_report_hd_movie0d1o7.pdfIn PDF document text
    • http://xerepanidobop.iblogger.org/agile_methodology_tutorial.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471096/normal_5fdcb67848e43.pdfIn PDF document text
    • http://sijufur.22web.org/gusakagu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379032/normal_5fcd1f21cc0e7.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/71803210430.pdfIn PDF document text
    • http://bozesedixek.mywebcommunity.org/31673590250.pdfIn PDF document text
    • http://1xbet-sportstavki.fun/dekumtqib4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_603d4d1fcc44d.pdfIn PDF document text
    • http://chambrehub.xyz/pabivitutiwikid393.pdfIn PDF document text
    • http://vurenosul.22web.org/95719791936.pdfIn PDF document text
    • http://svoydvalend.xyz/husqvarna_125b_spark_plug_ngkrpm5g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410703/normal_5fe127ac1f08b.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/5a621dee-18bb-4108-ad1b-9fdf6c455fa1/bijanalikifewamuso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56c88728-be76-48a2-98f3-6608bf550ca6/venutuzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c4a55de-91b6-47b9-b088-95f3c3ac8e57/what_is_deluxe_ham.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13aa475b-fbd1-4b97-9e80-a30f2fb349ae/95189083144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c8b3e09-7a8e-4c2d-8cf8-da4ca25e9879/line_6_spider_valve_212_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d0dfbb-1bc3-45de-9ace-d07d94d8daff/are_invisible_fences_harmful_to_dogs.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/basic_algebra_and_geometry_formulas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52e0d004-bc9b-4e1b-acc9-337deeede63c/data_warehousing_concepts_techniques_products_and_applications_by_c.s.r._prabhu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15109563-4d32-4588-9139-96a56c2e070a/matozid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc95fc8-377b-4026-a39e-652c542b4fd7/discrete_mathematical_structures_with_applications_to_computer_science.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_off0000d3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 5316 bytes
SHA-256: b4278dbf76971a9b27aee9b88d8b3396ed2d85c02957ca8e044df80d0c97df62
font_01_sfnt_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 10420 bytes
SHA-256: 49ac9804f8a4a3a492210720c594b16bbd8527aded13a4adff75cc5d5a81170d
font_02_sfnt_off00010900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10900 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c