Malicious PDF — malware analysis report

Static analysis result for SHA-256 17f1ca9439bdc38a…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 07:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bfc3e7478736f26d809e3172e9e4282e SHA-1: ed95751e694d3c8d6c3835621525816867c394d0 SHA-256: 17f1ca9439bdc38a7bb3a6623548c4fdef6c8010c3db8811abfa751e6e010d23
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The embedded URLs and the overall structure point towards a phishing attack designed to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/123?utm_term=dreams+cranberries+sheet+music+pdf PDF link annotation
    • http://tarigutese.mygamesonline.org/centrifugal_fan_calculation.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/wumizubafama.pdfIn PDF document text
    • http://vudasuti.mygamesonline.org/4144584384.pdfIn PDF document text
    • http://kivolugog.mypressonline.com/8133111196.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/steel_windows_catalogue_south_africa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/lyman_reloading_data_log.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_f1f3900935984ab7994ffef52c2e90ed.pdf?index=trueIn PDF document text
    • https://37b1cabf-41b6-4e27-befa-0fe7335ed416.filesusr.com/ugd/9d05b5_20ee43f4704346a0843f250b939589db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/schaums_outline_of_college_physics_9th_ed_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/29999652614.pdfIn PDF document text
    • https://e85625e8-91d5-48c2-95a4-67b7b95d5b39.filesusr.com/ugd/b97a97_07ae837a807844beab96e4c0fb5e087e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6ba174-6a78-4168-bc70-2bf4bb7a457e/ridexoraranili.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/dalaran_wow_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/31486948397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ef1b29c-2778-49c3-8756-8019cf0efc1e/506913979.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d36b8bf2ba1b4f56a9d47a01aaa08cf3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/89247362393.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_bbfcf7706c614302997154c148c84803.pdf?index=trueIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_a5e25609356448ee8ab06e04c4bf5770.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_6bf471ba83f6441c9fc6308aeea95bc2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a4d16ac-dc4a-4a36-9888-dc70f2667fba/fejudivawekepigetifokewix.pdfIn PDF document text
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_88ac5ebe20aa404c9624b8dda761e116.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29388f73-6dd9-4cc5-b57c-8317ff3c4a7f/rafibataputufimorex.pdfIn PDF document text
    • https://94226b1b-8363-4ad6-a779-e61b7b16ff5b.filesusr.com/ugd/b3bc21_e6506cb2100149248abd3b13abb98584.pdf?index=trueIn 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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 5504 bytes
SHA-256: 4f3aa8ce815be936a57357f7d3de5b5f8f9f84bd6da6d9b62796144ec9de0b96
font_01_sfnt_off000101d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D1 11796 bytes
SHA-256: b394ee969d93cff469de2c9368097ea48947fec97afb41375e748a286e26d425