Malicious PDF — malware analysis report

Static analysis result for SHA-256 a25ffd40bc5bf4ee…

MALICIOUS

PDF

83.9 KB Created: 2021-03-25 22:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2042b22332f92ae27699cb88758d87cf SHA-1: 6954a7f864f26e64c0d3e51071eeaf141b0adb86 SHA-256: a25ffd40bc5bf4ee3d44d18ee13643de8bdc1583b65d15d6bea76e1585e3a3a6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary one being `https://golowaki.ru/123?utm_term=girl+guide+camps+ontario`, suggesting a lure to a malicious site. The heuristic `PDF_SEO_DISPOSABLE_LINK_FARM` further supports the malicious intent by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=girl+guide+camps+ontario PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4453337/normal_5fc9f49a60281.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabakope/dE1hj3M/wasevewojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_604fbcf6a78cc.pdfIn PDF document text
    • http://thailandlove.site/stir_the_new_free_tvkqpc7.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/ihvjchc/pesobarezawa.pdfIn PDF document text
    • http://kinoogf.space/marketing_segmentation_noteswa8vf.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/hxscA3Z/nasty_gal_shoes_sizing.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_60053476165ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412382/normal_60303cedecf99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_79135f136b8c491fbd291b3c6ef0e074.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2770eb1c-eb62-459f-918a-2016363119d6/64066326142.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_1b6bcb771a8a4c6ab240b01e54674a6f.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_3fe28eb8d735409dbb6f8ed2914187d2.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_3f8721ca22b64b8b9917cc90f9ba5412.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/75a00eab-c756-499b-b443-30172a63e633/what_is_topology_in_computer_network_and_its_types.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab2c7bd-314b-4330-8dc0-bb698a32fdd1/28772054837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9017765-ca9b-4af2-bc76-069ad7849155/39334653507.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_b077eb5cd77b4d4e93dcf70483230e71.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 5424 bytes
SHA-256: ecd7308c1b6c505779464c6a3af25eab8d76cdf9f77c02e8e0474931401d129b
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 11920 bytes
SHA-256: 170bc01389d41743e949405a62004d8ce6de943121760c65aae513d305fc38cc

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