Malicious PDF — malware analysis report

Static analysis result for SHA-256 573d5ffc0b969e10…

MALICIOUS

PDF

71.5 KB Created: 2021-02-26 12:49:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 063a59a2d346259e862ef3b856ad78d9 SHA-1: 446549f4efc73132dbf81a1971dadc4b732f548b SHA-256: 573d5ffc0b969e10d147f897d6326ccc933f0ec5ba1efb6e46af4a87b906eca8
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/award?keyword=cub+scout+lion+handbook+2018 PDF link annotation
    • https://nakagikirowi.weebly.com/uploads/1/3/2/6/132695306/4294b52.pdfIn PDF document text
    • http://huseyincanx.com/174435747072uotn.pdfIn PDF document text
    • http://feyakast.online/6986513479365jl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404515/normal_6021f82ae1459.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5fdbdea348942.pdfIn PDF document text
    • http://6gusevshop.website/xudapota4b4ky.pdfIn PDF document text
    • http://rabota-plus.club/advanced_race_guide_pathfinderuvy6b.pdfIn PDF document text
    • http://arfesopt.com/acute_renal_failure_classification0c5f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374840/normal_5fc8ed557bb94.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/55048fec9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_5fd2f9c9de5de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423780/normal_5fcee0633817b.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/1e533756.pdfIn PDF document text
    • http://siondez.ru/17179456567lu2l4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366400/normal_5fce5b739906b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000da9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9D 5560 bytes
SHA-256: b68d5a9040ee29e6d134c55b845a26f62b2b03988f63453f7b06649838c46623
font_01_sfnt_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 10360 bytes
SHA-256: 35289c16fec794ce35504a86a9cf74bfea1f71b6c081740ac824719ab80b39a7

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