Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ac9df1c05a2e1cd…

MALICIOUS

PDF

70.0 KB Created: 2021-02-26 17:36:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 717ad06c26bb66576e047adc2042a318 SHA-1: 93f2d490945abfe9edad44ba964240702d8b7559 SHA-256: 1ac9df1c05a2e1cd537c1e535990301f8e05aade6ff7fbe1d2800071cb042d32
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://seumenha.ru/wix?keyword=winston+water+cooler+of+austin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376629/normal_5fd7d02f0cbd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_6009796806ff8.pdfIn PDF document text
    • http://sepoxudozixo.sportsontheweb.net/vovalikam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376625/normal_5ffbce171aa5b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5fee0cc079bc1.pdfIn PDF document text
    • http://bumalutaf.iblogger.org/grade_1_maths_worksheets_south_africa.pdfIn PDF document text
    • http://salet.store/nurgle_blood_bowl_set_uprz7br.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/xebuxuwitu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_5fe72aa34826c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5fed7e3cf139a.pdfIn PDF document text
    • https://cdn.sqhk.co/kusamika/aLZgexH/98888121526.pdfIn PDF document text
    • http://uchebnoe.website/zojuwakcz2id.pdfIn PDF document text
    • http://pazadixokumox.sportsontheweb.net/kesano.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417519/normal_5fd9a1cf0032e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456687/normal_6026e90380c58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410201/normal_601ee4feb0bab.pdfIn PDF document text
    • https://cdn.sqhk.co/gitaligido/7jfhfih/business_card_scanning_phone.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/30234692844.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xomexopiguv.rf.gd/nirurotuzagolarob.pdfIn PDF document text
    • http://zufejudo.epizy.com/tosawodenaxajemerezutit.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_off0000d61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61B 4980 bytes
SHA-256: 3b963dffd0a2fd3ca0bcd462d1301b96b5b7e5a9eba842931b57b34888fb2a32
font_01_sfnt_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 10412 bytes
SHA-256: 8df56e0154eccc8249dc6b8ceae3c38b67a51a9a7704357b2051eab5f1791739

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