Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85844b2f4bf372c…

MALICIOUS

PDF

74.9 KB Created: 2021-03-25 06:50:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc416d4e38e51bb5f671ec150c7d7174 SHA-1: 7f9f194fa5a8c7af73e4fe4c658ddc4021451a50 SHA-256: d85844b2f4bf372cc22ca6c10a5289c4fb1f69ffbd3c8adb1e670087084ae56b
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one, 'https://resalured.ru/123?utm_term=esempio+di+aeriforme', being actively promoted by the PDF's structure as a link farm. The PDF's structure and embedded content suggest it is designed to redirect users to malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF's nature points towards exploitation of PDF viewers or social engineering.

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://resalured.ru/123?utm_term=esempio+di+aeriforme
    • https://cdn.sqhk.co/bikugipozamu/gfuGOrc/7201006509.pdf
    • http://com-copyrighit.com/lista_de_verbos_regulares_en_ingles_presente_pasado_y_participio_y_significado5fcpc.pdf
    • http://tevopose.66ghz.com/nokori.pdf
    • https://cdn.sqhk.co/letarezetap/jjgcjiX/bluestacks_hd_app_player.pdf
    • https://static.s123-cdn-static.com/uploads/4407085/normal_5ff7e23d1d4c4.pdf
    • https://cdn-cms.f-static.net/uploads/4369760/normal_5fd79c96dbbaf.pdf
    • https://cdn.sqhk.co/woberimi/xzifLi2/gikezezifaxubipekelunepis.pdf
    • http://jelolizabuvixi.22web.org/assignment_guidelines.pdf
    • https://cdn-cms.f-static.net/uploads/4422386/normal_5fe9a5284736f.pdf
    • https://cdn-cms.f-static.net/uploads/4369162/normal_600aa33d06464.pdf
    • http://hookup756.fun/veruwezotavedewixokunokgoouf.pdf
    • https://cdn.sqhk.co/segidexu/gcYhgpK/samsung_s20_ultra_gsmarena_compare.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://navibav.epizy.com/excel_vba_loop_range_columns.pdf
    • http://zebusodevig.rf.gd/oa_abstinence_food_plan.pdf
    • http://nividibewejoba.rf.gd/97247234596.pdf
    • http://ramimivojis.rf.gd/97201996759.pdf
    • http://rivebop.epizy.com/niviverosu.pdf
    • http://zilomit.epizy.com/92488637341.pdf
    • http://banumekopi.epizy.com/jufuvejinukumuneketazixov.pdf
    • http://xojogaregukuged.rf.gd/ruvurowukutibejaw.pdf
    • http://xigutawime.epizy.com/everfi_answers_module_6_your_financial_future.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e549.bin
59cc390233dcf68cfa1f7e372e21a5c4b06d216832221582532c9c64ae477125		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 5112 bytes
font_01_sfnt_off0000f696.bin
c21ddf954bbc8a268252a6893fd45d51970597134941e45baf7a82dd52517da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 11872 bytes

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