Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d6b1638cb7405fc…

MALICIOUS

PDF

69.5 KB Created: 2020-11-19 15:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4e6b4699ce1b32f27cea8e823c029c8f SHA-1: 92734a468edc88e5655266202b3aa6692c2d292e SHA-256: 7d6b1638cb7405fca2d66391bf4e86acc6f2e7bf44dbe3c68543812169e2335c
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://traffine.ru/aws?utm_term=tamil+movies++2019+tamilrockers+isaimini PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4401703/normal_5f9e36eedcd03.pdfIn PDF document text
    • https://babilazumi.weebly.com/uploads/1/3/4/6/134666759/kader-saxiderepigep-vavuw-wisuzixosad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424982/normal_5f99135343540.pdfIn PDF document text
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/jasapamojuko_gefasigedo_jidezufagug_zetidosav.pdfIn PDF document text
    • https://kinoxumore.weebly.com/uploads/1/3/4/4/134463035/sagilefulusafa_fuvevilotan_pukutos_tonogidiwasi.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/7de66dd9-94e6-4032-96e6-80b0cb6ee3cf/foxfire_books_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/country_songs_with_g_c_d_em_chords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2da9c0f-e8b7-47f1-be14-717d5201fb2d/lengua_castellana_y_literatura_2_bac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6dab937-3479-4e82-a446-b990f3c9e24e/27357160114.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d64b66c-0788-4cbb-84ac-12f0ca6e242a/39595632246.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/fugepegutelosew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e12b9bb-3743-4948-b29e-874e94f295ed/77171011425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df185615-2fa7-4311-8a60-cf8c89a628d4/riwazareniminafitibo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/203aa7b9-fb9e-4a93-90c2-c64f82949a0f/gta_5_download_apk_without_verification.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3de7d939-bd5c-445a-b534-6d22a0c99d90/ik_durf_te_wedden_dat_ik_je_kan_kuss.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_off0000d433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD433 5500 bytes
SHA-256: f8130585c133085a911f11bbc6cf08005590b1849abc5da84d10f541a803e26f
font_01_sfnt_off0000e6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DC 10156 bytes
SHA-256: db2290d20df908bad07f5f4a15124861b8a7259d40a8f3eb3b4ce5b1800123d5

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