Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7b76f35d8f1309…

MALICIOUS

PDF

73.1 KB Created: 2020-11-14 22:00:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: dde92d852692c3119d1a144dc1c90210 SHA-1: 1d1f7aaa41316c4c2ae29a24cdf42624a3020db1 SHA-256: 5a7b76f35d8f1309b028178e31d35a60014690f4bd2f28c2e42af7b080e39a6d
156 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 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 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.
  • 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/strik?utm_term=areas+y+perimetros+de+figuras+planas+ejercicios+resueltos PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385012/normal_5f9a655c18317.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402247/normal_5f91ede0c6e6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376619/normal_5f900414ab4dd.pdfIn PDF document text
    • https://nitiruminaxodax.weebly.com/uploads/1/3/0/7/130738633/6567b724e27e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373998/normal_5fa35e4ae6d34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375073/normal_5fac5470c1610.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466368/normal_5fa3e81c81ac0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373999/normal_5f9f96b385c22.pdfIn PDF document text
    • https://bujufanabatoxiv.weebly.com/uploads/1/3/4/5/134598972/didawesobuluzutes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_5f938f9948b0c.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kigavanus/ice_boy_and_lava_girl_dream_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7052fa13-4241-4bce-ad6b-d20ab55d5b6b/56441343187.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_off0000d081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 1904 bytes
SHA-256: 54f0852bb562554f9c4d42a137c630179c7840735e60c02214ab00ec8703ee9e
font_01_sfnt_off0000d9d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D6 5644 bytes
SHA-256: 6c0eab7d6c91cabd5c699f85e29c4ec909a957509c26f8e5766bc6f68d988ca2
font_02_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 12176 bytes
SHA-256: 8d8db71645367fd39fb5ff16aee0e05feba705b4804c77f1a0a517e0c8ce4ba2

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