Malicious PDF — malware analysis report

Static analysis result for SHA-256 c445372f1b534ff2…

MALICIOUS

PDF

74.6 KB Created: 2020-11-13 02:42:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d54e86af16f6b5f1ad30cb591627ad7f SHA-1: 5aec4c5aceb89b670f2057199026a918f38c7666 SHA-256: c445372f1b534ff278416d965d8dc29d06281c19fef14bd30ac5364050f918f0
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffnew.ru/123?utm_term=avengers+social+club+drama PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fad8188ec36e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_5fad572a91202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375702/normal_5f9883d36707e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370266/normal_5f94a7554044f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5fadbc12dc817.pdfIn PDF document text
    • https://zoniziwaxetoxa.weebly.com/uploads/1/3/4/4/134441104/taneve.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/sepawi/74942205649.pdfIn PDF document text
    • https://s3.amazonaws.com/fopalew/how_to_analyse_likert_scale_data_in_spss.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/lspdfr_callouts_traffic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4822576-f965-4f44-b849-876968e3ea4a/1622043362.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/066ce63e-31f1-4aff-82ec-02f5eaf27798/zatusiramenujaramix.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/english_to_telugu_dictionary_online.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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 6288 bytes
SHA-256: 2e37ce41c5e6144d4125ecca8d28d834cfd52463e837e0bd06daa4228667292d
font_01_sfnt_off0000e308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE308 5448 bytes
SHA-256: 16387768ebec7bf8a13d7ff00cfcfebf66c3713d61f39b2a4212ee6a32530dee
font_02_sfnt_off0000f58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58B 11692 bytes
SHA-256: 73ce05f304d9a2f6578364fa5332daa1859b93c1313191eef816ac8de0783e0f

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