Malicious PDF — malware analysis report

Static analysis result for SHA-256 71995f51d1c58a3b…

MALICIOUS

PDF

79.3 KB Created: 2021-02-26 15:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 33eebb2195b1a261f11e995a08e22246 SHA-1: ab3ae0f4d0869f27cf148a615fc25a7aebb27332 SHA-256: 71995f51d1c58a3b33629623ccf75e3127f6334cbd179c12a1d3bf980a52a8f8
134 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external links, including one to 'zajinet.ru', suggests the document is designed to redirect users to potentially harmful content or download further malware. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zajinet.ru/award?keyword=harbor+breeze+ceiling+fan+light+quit+working PDF link annotation
    • http://didazema.mypressonline.com/66910196780.pdfIn PDF document text
    • https://mezinetoxapim.weebly.com/uploads/1/3/4/8/134887379/7520147.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/1057789.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478141/normal_6034328b89a62.pdfIn PDF document text
    • http://kesuvajeb.scienceontheweb.net/how_to_respond_to_one_word_answers_on_tinder.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/autocad_civil_3d_profile_view_styles.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/what_are_the_different_types_of_process_outsourcing_available_for_a_project.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/594f97c2.pdfIn PDF document text
    • http://leninuludobodu.mygamesonline.org/what_is_the_average_child_support_payment_for_one_child_in_michigan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/36323685800.pdfIn PDF document text
    • http://senoneba.rf.gd/gurobagipowejuzazo.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/roduxovalezek.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/adventure_quest_worlds_android_apk.pdfIn PDF document text
    • http://gibapomidumitar.rf.gd/is_true_detective_on_netflix_or_hulu.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/73065786117.pdfIn PDF document text
    • http://wuvasof.epizy.com/56386959167.pdfIn PDF document text
    • http://roxujewov.myartsonline.com/75036216523.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/14622100926.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_off0000f222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 5400 bytes
SHA-256: 684bb66e2ac2b90a3e83166398570f7046ed0b837c87581856aba1ec81b6fcb0
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 13404 bytes
SHA-256: 590f2ee69250d07dbc64a9e4b983ddc5482e80fbd2cc4c647e640cc27364dc06

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