Malicious PDF — malware analysis report

Static analysis result for SHA-256 777870103747ea68…

MALICIOUS

PDF

78.3 KB Created: 2020-11-18 01:06:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 83d54f50b3c0fc6872c24217fab44333 SHA-1: db82ab44a417115694baa021279112de1e7fe5d8 SHA-256: 777870103747ea68305779e67bddec929075c6f5d05d9cdc900f27167989b7ea
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 0.9996

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://trafftec.ru/123?utm_term=west+coast+jazz+albums PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88dc8fa91d0.pdfIn PDF document text
    • https://gesinanafu.weebly.com/uploads/1/3/4/4/134481382/bevob.pdfIn PDF document text
    • https://runebipunozup.weebly.com/uploads/1/3/1/4/131406604/2937030.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_5faef9693cf03.pdfIn PDF document text
    • https://gimelukisisira.weebly.com/uploads/1/3/4/0/134040832/zetugalosuti.pdfIn PDF document text
    • https://vonubaxuted.weebly.com/uploads/1/3/1/4/131452839/xiroxoxolaga-jeseranelimaw-zudaliwuruxow.pdfIn PDF document text
    • 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/nimuwet/fall_in_love_at_first_kiss_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/roxujuku.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/clep_natural_sciences_study_guide_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/reactions_in_aqueous_solutions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/46794332772.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/pomifipidexod.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/pathophysiology_of_shock_sepsis_and_organ_failure.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 4856 bytes
SHA-256: 08b06a9ca8d5e6e9bae8dc7cf18cec27244cb6c9fd77d9c824317161b789a000
font_01_sfnt_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 11452 bytes
SHA-256: e36b884062d8462d1160db33862a1b1d7e38daf03e35ed90a2694a133a3d1cd4
font_02_sfnt_off00010319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10319 17680 bytes
SHA-256: 1b4b2b82c8976ba7928a12e23eae283bf93b15106e23866ba5f013ae9b03d361
font_03_sfnt_off00011e18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E18 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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