Malicious PDF — malware analysis report

Static analysis result for SHA-256 990210c2f626dfe2…

MALICIOUS

PDF

62.3 KB Created: 2020-11-24 23:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cbcb562c7a231a2c3675d985d8995fa1 SHA-1: 1f0a38fab802bd0dfe27c85c844e686fc9f78192 SHA-256: 990210c2f626dfe206515d8a7a0a0513fa9c98b5a6f561fa9e54bfe0a85dc71e
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 0.9996

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/123?utm_term=uga+school+calendar+2016 PDF link annotation
    • https://sowosevutab.weebly.com/uploads/1/3/4/3/134311467/e7fb28f7.pdfIn PDF document text
    • https://jowamevo.weebly.com/uploads/1/3/4/5/134511132/a808eacfd7.pdfIn PDF document text
    • https://tanaxigurav.weebly.com/uploads/1/3/4/2/134266775/5476235.pdfIn PDF document text
    • https://tatunonomufobuf.weebly.com/uploads/1/3/4/3/134355176/bivepam.pdfIn PDF document text
    • https://fuvipizewovotat.weebly.com/uploads/1/3/1/0/131069886/libisunogukave.pdfIn PDF document text
    • https://guvapokasek.weebly.com/uploads/1/3/4/4/134437462/9ecb1c6.pdfIn PDF document text
    • https://mefapepuj.weebly.com/uploads/1/3/4/3/134310437/4518594.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/bupaxomu/aws_solutions_architect_exam_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/55578616938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7955f352-1227-4058-8af2-3b1bd2154336/84663302779.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/smoot_hawley_tariff_act_apush.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_off0000b62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB62B 5672 bytes
SHA-256: c60101baeef43e1adb2aae763122339e841ad8839db133c062c5594709f476ac
font_01_sfnt_off0000c979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC979 10652 bytes
SHA-256: 6e39207fc9eb0877f43e68750c9a2266c172bbfcdd4d2d0500f05008b78789f8

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