Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc084480fc1e631…

MALICIOUS

PDF

75.3 KB Created: 2021-03-04 10:40:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2271cb0b7b97565d757317dd309620e0 SHA-1: 7050f6b262e9cf3d820a2445941bd6d7f17efc5d SHA-256: 5dc084480fc1e631e38e154bcba85d7e9a5c5ee0d84103387763500538fb1c77
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to attract traffic or distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/award?keyword=regular+and+irregular+verbs+definition+in+urdu
    • http://andyhongdigital.com/jurassic_park_3_in_hindi_download_filmywapi17xi.pdf
    • http://sale50.pro/adobe_acrobat_dc_2015_serial_number_location0etmm.pdf
    • https://pagudibaxite.weebly.com/uploads/1/3/1/4/131410234/376671.pdf
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/kizijoberuk_didimipaxivamab_rujaw_xazapewufoleluf.pdf
    • https://xedutogozazinar.weebly.com/uploads/1/3/4/5/134505586/7890512.pdf
    • https://falojaba.weebly.com/uploads/1/3/0/7/130776150/8219344.pdf
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/0f51350c2a6e18.pdf
    • https://duzufeto.weebly.com/uploads/1/3/4/7/134734580/6285562.pdf
    • http://meblik.su/bedwars_map_1v1sz545.pdf
    • https://sexuviruzimi.weebly.com/uploads/1/3/2/8/132814305/vufado-renaxizelo-ninitoxidej.pdf
    • http://zatuzosej.iblogger.org/naming_organic_compounds_with_functional_groups_worksheet.pdf
    • https://cdn.sqhk.co/famuxina/5MXhaie/nivijetumopodudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fuvozakini.epizy.com/80238298252.pdf
    • http://fawumewaja.epizy.com/13075745895.pdf
    • http://winovewivigo.rf.gd/49022936241.pdf
    • http://rakejobik.epizy.com/nadenatebefuputewavuxov.pdf
    • http://makunixiwelukiz.rf.gd/ds_lite_release_price.pdf
    • http://walefofu.rf.gd/haematology_mcq_with_answers.pdf
    • http://gitipezusev.rf.gd/92432085357.pdf
    • http://wifobujaxude.epizy.com/national_emt_exam_study_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de60.bin
cee1a0ac16a3933aa17c17a0dd6e75f6188f73d975166a4b4380e094611e7485		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE60 5164 bytes
font_01_sfnt_off0000f001.bin
4e98bd077385f0f6ecd676eea4bc3bc128dade0b2953add3c720e2d82c860601		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF001 9704 bytes
font_02_sfnt_off0001112f.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 4324 bytes

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