Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef052f6f8f252daa…

MALICIOUS

PDF

80.4 KB Created: 2021-03-09 07:02:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5f43ec87c65b85452973e8244089348f SHA-1: f1c3da42f106301e12b81ff55351d98c542a5fe2 SHA-256: ef052f6f8f252daa32a4aa7cac3e4cc1d7f468a8c45ca9ceb073e7dfa85f5dfb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, with a notable heuristic identifying it as a link farm on disposable hosting. The primary URL, https://midufefew.ru/123, suggests a phishing or redirection attempt, likely to distribute more malware or engage in SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://midufefew.ru/123?utm_term=after+meeting+action+plan+template PDF link annotation
    • http://melowimaz.getenjoyment.net/98107658953.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471682/normal_603a4bc8ec79b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60419b8e30ef5.pdfIn PDF document text
    • https://zamivevi.weebly.com/uploads/1/3/1/4/131437513/5520093.pdfIn PDF document text
    • https://tivagirususu.weebly.com/uploads/1/3/5/3/135350390/6441452.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469841/normal_5ff5a62a7f06a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_6043405c35b48.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365619/normal_60090ce2e3a13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377101/normal_5fc60335d40e2.pdfIn PDF document text
    • https://rakonudiboxenej.weebly.com/uploads/1/3/4/8/134874851/dagagexofot_xivofarofe.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/jjhhaib/ppob_pulsa_mmbc.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fnom6Qw/warzone_update_season_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_5fd354b8481c9.pdfIn PDF document text
    • https://cdn.sqhk.co/vakenuda/iggIjch/total_war_shogun_2_gameplay_espanol.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/gYhfSKf/slots_vegas_magic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_603c021360f6d.pdfIn PDF document text
    • http://dewemopiwofim.22web.org/unconformities_in_rock_layers.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/zijgjha/soulier_femme_chez_yellow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500183/normal_5ff8a383171d1.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
    • http://gezixus.myartsonline.com/78803441126.pdfIn PDF document text
    • http://wemuvolelotufe.epizy.com/pretty_little_liars_season_1_episode_4_summary.pdfIn PDF document text
    • http://kasisexa.rf.gd/favowosiwi.pdfIn PDF document text
    • http://xusegejelugebit.epizy.com/talirive.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_off0000f1da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DA 4936 bytes
SHA-256: 6b8b90fc6666ace57260c1cfee84756e241a5116ab583e98945848747a7a4a3b
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 10460 bytes
SHA-256: 919a8acedeb2cb9d5dad64396b692b4c39a05fedde04aa8bdffe0c85fafac377
font_02_sfnt_off00012610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12610 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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