Malicious PDF — malware analysis report

Static analysis result for SHA-256 432a99f2664e020d…

MALICIOUS

PDF

78.7 KB Created: 2021-03-29 13:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b7be5aac7619207f1b7907e3403a1fc5 SHA-1: 9bf337b85aa91779b5eb9111daa27b917062eecc SHA-256: 432a99f2664e020de8315a8a525fbf297075ffb81b9c09f8f733fa5a6afda587
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://baarspo.ru/wix?keyword=saucony+powergrid+guide+8+men%2527s+running+shoes PDF link annotation
    • http://wekeb.space/different_kinds_of_process_flow_diagramk0uzk.pdfIn PDF document text
    • http://hookup750.website/life_history_of_swami_vivekananda_in_kannadadeuku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff89f9c5dfa1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375077/normal_6007b50e84035.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/c83e0731-f6a7-4f70-b49c-6144346d2729/resuz.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_0325b0ef0d614502b54629664392db15.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0fbfab0-f840-4f5d-881a-ad460b270a5e/furepurukodusesa.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/matlab_graphical_user_interface_guide.pdfIn PDF document text
    • https://003d8133-376e-43b8-9331-09740c1660e0.filesusr.com/ugd/5ecadc_280f0f053a724234a5ae52ded4fc099f.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_883ac2bbf9b149a4b9eef1c9eb15ce70.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53c436b-57db-480f-a7bb-967ebe319a60/maths_important_formulas_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/angiomax_davis.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/burkert_6013_manual.pdfIn PDF document text
    • https://63209029-b609-4f89-80e5-af59b408cdb4.filesusr.com/ugd/0713e6_dcfdb2be19f441de91f5784d0fb68694.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/38220218243.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/fivesodita.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_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 5980 bytes
SHA-256: 30985bfa596aa37489eec396be0a9783a08275941e9ecb1d2d07fc781edc195b
font_01_sfnt_off0001087b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087B 10908 bytes
SHA-256: 1f8db541a6c5a6f9f4745595af281cda63c027a770e06026ebb0e61e74e62e79

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