Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9996e4cdcb12b9…

MALICIOUS

PDF

74.9 KB Created: 2021-03-14 09:55:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3efe1c9f31b14d95f57ec19da7c57dfb SHA-1: 5e676febeb54299147641e2880d7e5d2f4615853 SHA-256: de9996e4cdcb12b9bc62aebe0c6291274a2b2d53d6a802aafd03527026f1f06f
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=slave+contract+examples PDF link annotation
    • http://bogplaktnc.fun/54652680524d4t21.pdfIn PDF document text
    • http://design-kvartira.info/remember_me_coco_sheet_music_guitaruqvj3.pdfIn PDF document text
    • http://xevidome.iblogger.org/easy_voice_recorder_pro_apk_uptodown.pdfIn PDF document text
    • https://cdn.sqhk.co/mobirewin/QWgiBs5/15766509817.pdfIn PDF document text
    • http://laitlabs.pro/84372934145yz2i6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475738/normal_5fd1be06b2dab.pdfIn PDF document text
    • http://iranomics.com/23811059574w3mch.pdfIn PDF document text
    • http://copyright-rules-help.com/kofuzau59m3.pdfIn PDF document text
    • http://magnifioco.site/60992541491q0fm5.pdfIn PDF document text
    • http://de-bewertung-889562.icu/kiwusexeduxapusaxafinejee18k6.pdfIn PDF document text
    • http://pihodze.com/gapekalozewefomepaveroreh50rm.pdfIn PDF document text
    • http://poverkavoda.website/62479955250qrkzw.pdfIn PDF document text
    • http://geekcods.com/38735516424o1s9p.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/giZjfAn/94636256443.pdfIn PDF document text
    • https://cdn.sqhk.co/faxonudogot/jcNge8J/69162026314.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_60135e69c2a0b.pdfIn PDF document text
    • http://insta-sale.site/turibamkml1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jeduxotikeg.rf.gd/2005_honda_accord_oil_change_reset.pdfIn PDF document text
    • http://kotutuvotijol.rf.gd/xamafenodexinamosinelomov.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_off0000e6f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F0 5308 bytes
SHA-256: 666cb39b14d89f64e9f0f8ecea7f985482f4c1839842d0f9d856ea0059fe5724
font_01_sfnt_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 11124 bytes
SHA-256: 27223a7ffdc7ff0b40d0f5d29e7077b40345595d179a39d01f661267238b295e

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