Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b10e6eed052f89…

MALICIOUS

PDF

97.4 KB Created: 2021-03-03 17:19:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cf1d58d8009b62210d342072a4bce6d2 SHA-1: acb990044d23f49b7a83fc6f9e1f37a3b5570143 SHA-256: c4b10e6eed052f8985c644644d3f162b0fdb11441f3b1f9ee4b50abe97db8202
96 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a machine learning classifier and ClamAV, as malicious and likely phishing-related. It contains an embedded URI pointing to 'pelibifir.ru', which is highly suspicious. Although no scripts were explicitly extracted, the presence of embedded URIs in PDF documents often indicates an attempt to redirect users to malicious websites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/wix?keyword=%25E0%25B8%259A%25E0%25B8%2597%25E0%25B8%25AA%25E0%25B8%2599%25E0%25B8%2597%25E0%25B8%2599%25E0%25B8%25B2+%25E0%25B8%25A0%25E0%25B8%25B2%25E0%25B8%25A9%25E0%25B8%25B2+%25E0%25B8%25AD%25E0%25B8%25B1%25E0%25B8%2587%25E0%25B8%2581%25E0%25B8%25A4%25E0%25B8%25A9 PDF link annotation
    • http://pazadixokumox.sportsontheweb.net/fojunovo.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/44862936115.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383471/normal_5fe539f6a536a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408485/normal_60183741ebc49.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/1984_chapter_1_questions_and_answers.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/duroxogozibi.pdfIn PDF document text
    • http://jamotovoxut.mywebcommunity.org/siemens_hearing_aid_ear_tips.pdfIn PDF document text
    • http://xawamiwupajev.mygamesonline.org/8497008367.pdfIn PDF document text
    • http://kiwenalod.medianewsonline.com/motorola_talkabout_t200_manual.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/michael_jordan_the_life_review.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/3736321951.pdfIn PDF document text
    • http://koxixamenima.rf.gd/65169367564.pdfIn PDF document text
    • http://pojozija.onlinewebshop.net/77144414465.pdfIn PDF document text
    • http://nuzavaxevarap.epizy.com/genufir.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/slide_power_point_animasi_bergerak.pdfIn PDF document text
    • http://zinipuzotekum.rf.gd/derecho_romano_resumen.pdfIn PDF document text
    • http://xobebol.onlinewebshop.net/nedekumubanuxafuf.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/platform_biker_boots_new_look.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/16077425315.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/govuxegubedaxaranaj.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011821.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11821 18080 bytes
SHA-256: d843211a602b8ece66039d1e00c1d74a28482ace6e8a009be5163e9b6fd97730
font_00_sfnt_off0000e729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE729 3932 bytes
SHA-256: 42ce3273063ed395feff16de6026195e5a0bc3d9dfbcc74bd27b9802587ec209
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 4068 bytes
SHA-256: 825d245a28f7bed6fbdbade82728acf9a8036f91ec8daaf7884700253fd46385
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 8040 bytes
SHA-256: 084bf50f3d1d48aad04ff8a879278df20ad927140abf3cde798871a42421b2c7
font_04_sfnt_off000148e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E5 13868 bytes
SHA-256: 2d1da2d31406685ef300a902cf2a547b9da83319787f8b8f3a111cbde78ce427

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