Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd21371d50e720ba…

MALICIOUS

PDF

89.3 KB Created: 2020-11-28 00:38:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6deb45c430e65501edda3017868fd7e5 SHA-1: 20cf38b9e8cf87285c8b0d8b9815283a024bd143 SHA-256: dd21371d50e720ba230608c9e503b2a96c7b2eb0349d41e734d6628e5c663370
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://traffset.ru/aws?utm_term=acc+aha+guidelines+2016+hypertension PDF link annotation
    • https://fudafovagovareg.weebly.com/uploads/1/3/4/8/134868702/255dd7b.pdfIn PDF document text
    • https://niweduval.weebly.com/uploads/1/3/4/3/134349673/janakekatupe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387411/normal_5f9913d08f5b7.pdfIn PDF document text
    • https://virenogapugutu.weebly.com/uploads/1/3/4/6/134635416/e0d6c.pdfIn PDF document text
    • https://wisapemewe.weebly.com/uploads/1/3/4/7/134713478/e69257265.pdfIn PDF document text
    • https://fewaxozane.weebly.com/uploads/1/3/4/3/134341296/6e17de3bc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384464/normal_5f8c468b7baaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486550/normal_5faafa93601e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8769d6d0865.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447263/normal_5fa94cc30149c.pdfIn PDF document text
    • https://xexovelez.weebly.com/uploads/1/3/0/8/130813416/1645068d5b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/869d8825-a25d-4354-b7e5-010beb71f9f4/magical_cat_names.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 5788 bytes
SHA-256: 1e748447efe08e89fd20533bcc58e2eee3605038fb575c381c4ce7f8867b5c4c
font_01_sfnt_off00011b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B81 14568 bytes
SHA-256: 6c7bc2541f0b3f0bc026eceda650fa202345336bc00b279436770150281a8309
font_02_sfnt_off000149d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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