Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f01549695253e8…

MALICIOUS

PDF

67.4 KB Created: 2020-12-05 17:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2d61d9c914cab926f635ce6936b6b986 SHA-1: da9d1a46376b3aa477f3e0debc6432ff139b05cb SHA-256: 18f01549695253e8efbc0f2275ec73cc29326c5232d9a1a8a936118a82235efe
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 0.9998

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://traffking.ru/123?utm_term=golden+carp+wow PDF link annotation
    • https://lefoxidegej.weebly.com/uploads/1/3/4/5/134526886/9301f91882f56b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443325/normal_5fbce713c05bc.pdfIn PDF document text
    • https://ladasewesadil.weebly.com/uploads/1/3/4/6/134665294/dodazesijasuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5f97eda943dbf.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/lolufobuvilutada.pdfIn PDF document text
    • https://xusawoji.weebly.com/uploads/1/3/0/7/130739635/wavek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460678/normal_5fba785580753.pdfIn PDF document text
    • https://tazuwadafif.weebly.com/uploads/1/3/4/8/134857375/vafivis.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/7622410.pdfIn PDF document text
    • https://biwawidojimu.weebly.com/uploads/1/3/4/6/134648839/50ad639fb5e65.pdfIn PDF document text
    • https://kibinino.weebly.com/uploads/1/3/4/6/134603545/piluwog.pdfIn PDF document text
    • https://butegipabozu.weebly.com/uploads/1/3/4/2/134235803/rilokebaki.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5fc6f42355981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc50dfce5c7695ca9b64519/t/5fc5ac994e98326c02d532c4/1606790300944/rubbermaid_reveal_mop_pads.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e63755b-49ac-4f89-8f9b-787b6365e971/dnd_5e_elemental_monk.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_off0000c9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F9 5012 bytes
SHA-256: 4405bc60e2b408213f37db17b6a1024c29c9db2ffd767a55eee8d4183b6b5f21
font_01_sfnt_off0000db28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB28 11220 bytes
SHA-256: c8bc50bd038fcc3355c3ef1810a9c362a6121558a0048541d66d1fa96b80cc52

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