Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d1b81487ca04c2…

MALICIOUS

PDF

78.4 KB Created: 2021-05-10 21:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1ac0547bbc2de0c489e0bfeeeb212df2 SHA-1: cd1edf5249bae97041733305a56fc06891bf1426 SHA-256: 93d1b81487ca04c20e58857745f20a4743e309845886fb3a7f33bb4dd29e6468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary suspicious URL being https://jacksth.ru/strik. This suggests the document is designed to direct users to potentially malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/strik?utm_term=scriptures+on+letting+your+light+shine PDF link annotation
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/dobosolukas-fitawibajoz-satakorizuv.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/abordagens_psicolgicas.pdfIn PDF document text
    • http://genokoti.iblogger.org/bhavesh_joshi_superhero_movie_filmyzilla.pdfIn PDF document text
    • https://loxerujose.weebly.com/uploads/1/3/0/7/130775489/c890b9916c0860a.pdfIn PDF document text
    • https://jubaluwaruzazux.weebly.com/uploads/1/3/2/7/132740890/4102235.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/13085184930.pdfIn PDF document text
    • http://xumugawejal.scienceontheweb.net/65302552736.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_a816269849b246b18cdbe5fc32d81778.pdf?index=trueIn PDF document text
    • https://44034db3-6cdd-4729-adf3-7ccd6afcf354.filesusr.com/ugd/9fe9cc_b1319dc7bfb544e0b608792864674819.pdf?index=trueIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_32614d32b3ff4abeb92b4f9b1906100d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/sports_direct_infant_trainers_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/bolivia_tourist_visa_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/celulares_android_economicos_en_colombia.pdfIn PDF document text
    • http://suwimifu.rf.gd/pamupodewamajij.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/is_algebra_2_the_same_as_college_algebra.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/corporate_poster_design_free_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/how_to_use_mr_coffee_5_cup.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/piwuzus.pdfIn PDF document text
    • http://ferurexage.epizy.com/50966787328.pdfIn PDF document text
    • https://d5fd0048-bb8d-45a1-ba21-28d1cb0b7162.filesusr.com/ugd/5e8de6_70cdb9713cdd4f0b8c775ada0f3ebd3d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/asphalt_6_adrenaline_mod_apk_free.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_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 5192 bytes
SHA-256: a6a3169599c032cb990a164cd7faefc0400d5cc9173092e417f35ab222226420
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 11068 bytes
SHA-256: 438fa351456ff836905c47cb7d1ba718f53960b7fad37366857aa99846c2aae5

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