Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97740a1d2f74232…

MALICIOUS

PDF

68.7 KB Created: 2021-01-02 12:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 212ee83fb67610570ba7faa4cfa00d36 SHA-1: 81530d41d8101805d6da324112553ed0e2d1b229 SHA-256: a97740a1d2f742321fb65d125bce6dcef6f9843400c19e26929b71250e91606f
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 0.9998

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 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://trafftec.ru/aws?utm_term=application+for+duplicate+marksheet+in+english PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417813/normal_5fdac9f78c13d.pdfIn PDF document text
    • https://tivexafo.weebly.com/uploads/1/3/4/3/134348633/jabogobopiribi_xemamum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_5fd646ee400d0.pdfIn PDF document text
    • https://bofezukidev.weebly.com/uploads/1/3/4/4/134464138/94e408212f489.pdfIn PDF document text
    • https://cdn.sqhk.co/sofopiro/2olRgdI/49374792941.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/begoderunarujofegu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_5fbb04a5b42e0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/10006850-c26b-4878-bd84-baf6afbec2de/jokamijajibekinuvinote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c457b5-80e7-4b5c-afa9-ed08fc23b6ef/pewdiepie_tuber_simulator_free_bux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47cbc4e4-98ce-4b1d-87bb-0d62f48c886c/36300523909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc07b9d-14bd-45f8-86f3-02958b4c776b/mp3_downloader_unblocked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f802e80-841b-469d-a294-d9f74a9fe81d/90115414119.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_off0000d029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD029 5624 bytes
SHA-256: 5120496cdeec8b23801a4c9203c210b862eec9c6b1bde4aba5e6213ff4872790
font_01_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 10096 bytes
SHA-256: ffc1dbe973a58b0acf9887d633d84402a879d58b44187c932874ff11da8e1706

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