Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b737be3e545df6d…

MALICIOUS

PDF

45.6 KB Created: 2020-11-07 02:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23bddee41e760be5f6fbfd06bf49389d SHA-1: 19d172d01e4a70066bb5539ec15f0ab02d1c0d64 SHA-256: 6b737be3e545df6d6a87f7f34618189de0d6aa887663f06dd8357898122b248b
96 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 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 1.0000

Heuristics 4

  • 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/123?keyword=definition+of+incremental+plagiarism PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nowonovege/security_threats_in_cloud_computing.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/40410963993.pdfIn PDF document text
    • https://zojemadej.files.wordpress.com/2020/11/73587489466.pdfIn PDF document text
    • https://sufuvuse.files.wordpress.com/2020/11/3074016501.pdfIn PDF document text
    • https://fefitaw.files.wordpress.com/2020/11/64939725781.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/jee_mains_b_arch_question_paper_download.pdfIn PDF document text
    • https://s3.amazonaws.com/minaxigevani/example_of_a_lesson_plan.pdfIn PDF document text
    • https://vetutunivik.files.wordpress.com/2020/11/77580657971.pdfIn PDF document text
    • https://rezumisoju.files.wordpress.com/2020/11/5297228756.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/calcium_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/wells_fargo_hours_today_near_me_77084.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13010adc-4d3a-4e32-8bb8-685c02eb6070/81953812576.pdfIn PDF document text
    • https://zefegize.files.wordpress.com/2020/11/abbyy_finereader_12_professional_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/pukolukasofexobu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/dexter_blood_splatter_gif.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_off00006645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6645 5120 bytes
SHA-256: 47df555c10823384617301d5b733542b818fd6321d1a93e6bd203f90ab5e1af5
font_01_sfnt_off00007795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7795 10492 bytes
SHA-256: e1448532931ee50775003e781e6bd7861faf877ab8321103c6892ecf00f9d557
font_02_sfnt_off00009b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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