Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f549b6a2296b196…

MALICIOUS

PDF

110.7 KB Created: 2021-03-28 04:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 840952f7ba3b572f76b51d1cea2e2020 SHA-1: 76b81b392a775b960f73ecc342796190e4c6330b SHA-256: 1f549b6a2296b1961e9acda45b12c2013287179da5c9073b530c694b4618439f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model with high confidence. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL, 'https://dugedepap.ru/strik?utm_term=how+many+words+is+11%252F22%252F63', which is likely the primary lure. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=how+many+words+is+11%252F22%252F63 PDF link annotation
    • http://winoraama.fun/19531266059qm4ts.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480880/normal_6053777405e0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502870/normal_600c803b9da10.pdfIn PDF document text
    • http://lnstagram-blue-ticks.com/pipitakalukf1zdq.pdfIn PDF document text
    • http://livethailand.fun/why_did_my_keurig_stop_brewingdqxb5.pdfIn PDF document text
    • http://prizinsta.site/american_history_x_2_trailer_ita88c9b.pdfIn PDF document text
    • http://bestita.space/xifejimakitofaruebjdm.pdfIn PDF document text
    • http://esagafow.fun/la_santa_biblia_catolica_latinoamericanaizogr.pdfIn PDF document text
    • http://suguxilaxiz.22web.org/easy_keto_diet_plan_uk_free.pdfIn PDF document text
    • http://fineagencyy.com/29800431168jk9a4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5fc62412d1b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407777/normal_5fee72531e082.pdfIn PDF document text
    • http://itsamorem.com/home_assistant_raspberry_pi_4_32_or_64_bit5zwb8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecd0321c-6271-4074-bea4-a1e4fdde6022/how_do_you_reset_a_nuvision_tablet.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_f5c0352609514770ba7b466cc40b8da4.pdf?index=trueIn PDF document text
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_cc641f61b20a4a65b2889226204b4c9a.pdf?index=trueIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b2af7588810b4f2ab966937e4d8306e4.pdf?index=trueIn PDF document text
    • http://jojexapopexevof.epizy.com/velabozirus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/013fd50a-6a96-4b67-95d7-52ea2fef671e/what_is_the_definition_of_unity_in_art.pdfIn PDF document text
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_a93661c76757425695d82494b6427dca.pdf?index=trueIn PDF document text
    • http://piwelipad.rf.gd/iluminaciones_walter_benjamin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e24bf66-2ffd-45a7-a307-ad686bf46d9a/an_ember_in_the_ashes_series_book_3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001729e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729E 5632 bytes
SHA-256: 0cea611b5ab3c5499af0d6e691e0f485a1f5873305714cce333ec3b7bee6e084
font_01_sfnt_off000185d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185D5 11676 bytes
SHA-256: 9dddc588946f16165af7f64d1b45d43e00b74914315af33a2685a8df28c5755d

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