Malicious PDF — malware analysis report

Static analysis result for SHA-256 224c8ca36f74058b…

MALICIOUS

PDF

71.6 KB Created: 2021-03-04 00:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e6b3e93b45549e6c475e5862dfa71135 SHA-1: 2b67d36a2b6ac0e6a223ab8f139a647209886875 SHA-256: 224c8ca36f74058b79ca33de5f149730b4b74af60beaf4eb5937a3ce93c969f6
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDFs, indicating a link farm for SEO manipulation. The primary URL suggests a lure related to Excel functionality. ClamAV and ML classifiers strongly indicate malicious content, specifically a phishing or trojan PDF. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

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 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.
  • 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://dafemum.ru/award?keyword=how+to+curve+arrows+in+excel PDF link annotation
    • https://cdn.sqhk.co/devisofage/Nhcjdhe/tedebososij.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411921/normal_600074431cc88.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/cKichjP/new_hard_rock_music_bands_soft.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368770/normal_5fe4019a7aead.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/hdM6Uge/palixijeladozarevegase.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367299/normal_6005380a8feaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwiketi/ic0ZAjb/vuxiruwijez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_602a2bd0a2f02.pdfIn PDF document text
    • https://dojiladise.weebly.com/uploads/1/3/1/3/131379401/dipinotufun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443337/normal_5fd8ceb96bb06.pdfIn PDF document text
    • https://cdn.sqhk.co/banuluwopote/CWjcuib/twisted_tea_alcohol_content_tall_boy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_600adb1fb57e6.pdfIn PDF document text
    • https://cdn.sqhk.co/xifinelire/jggjngc/35456021793.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/6TjevRk/ultimate_arctic_simulator_apk_android.pdfIn PDF document text
    • https://cdn.sqhk.co/zudilubal/xIghMig/tangled_up_in_you_tattoo.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/zurovajij/gtd_weekly_review_template.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/78803368387.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/15837559779.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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 4976 bytes
SHA-256: be51362dee3a5e88ff226c523e88765e72022620381bff57ebe9017e57ae9bcb
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 9992 bytes
SHA-256: 35e8068c0781b85f5a0f0a9c2409c5db54281719c83f8612902c5c73d1c403da

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