Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb8b06c4e8fd0ee…

MALICIOUS

PDF

78.0 KB Created: 2021-02-14 04:27:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e842c645d3ff7bb8b81f7982fe2c0522 SHA-1: 56fa9b1037e5b5c5235ee511b2aef989b4d08a00 SHA-256: ecb8b06c4e8fd0ee7de07859a8c330c47c6045bb7836d390cdf670c032ffa623
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=elite+dangerous+where+to+buy+ships+near+me PDF link annotation
    • http://formblckr1.xyz/16270689836zc66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458413/normal_6027688a9456d.pdfIn PDF document text
    • http://tisigetid.iblogger.org/composite_materials_text_book.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_600287ef9e702.pdfIn PDF document text
    • http://midumadataresut.66ghz.com/ammi_ammi_ammi_kannada_song.pdfIn PDF document text
    • https://lepepapiminokuj.weebly.com/uploads/1/3/4/4/134493398/de954898df8e71e.pdfIn PDF document text
    • http://maykistore.ru/jedonupu26v5k.pdfIn PDF document text
    • https://jozevupipe.weebly.com/uploads/1/3/5/3/135346753/bakivevo.pdfIn PDF document text
    • http://rijupoxog.22web.org/across_the_stars_sheet_music_flute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423188/normal_6010c71ea25bd.pdfIn PDF document text
    • http://energierecrute-emplois.com/romobopotoqcal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femubavavozemag.epizy.com/98215228617.pdfIn PDF document text
    • http://nigojelur.epizy.com/carti_beletristica.pdfIn PDF document text
    • http://sugizujesel.epizy.com/kemopekimefusorenofez.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_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 5664 bytes
SHA-256: ead3162d11987d36de4f0e18c69ce87dd2819adb8200af2ea9d57c50205ff211
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 11440 bytes
SHA-256: d31f69ac9e9f4b61345d1f89fad07df3a05e6564e3a964fd46651b0e7994f8f7

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