Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b23645bcb7276dd…

MALICIOUS

PDF

77.2 KB Created: 2021-03-01 16:18:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: e61e6fcaa3c6d1bb36380fa3114e8fe4 SHA-1: 5bf2436ab2497babef7ad3006a9639161c10a77b SHA-256: 4b23645bcb7276dd1fe900c8f9553870d065c39bbd1b64405f636a6a26dc5b45
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 generated in a link farm pattern, suggesting a phishing or SEO poisoning attempt. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/award?keyword=aircare+ma1201+whole-house+console-style+evaporative PDF link annotation
    • https://cdn.sqhk.co/pefevepufi/jbhiBme/netflix_vr_box_android_app.pdfIn PDF document text
    • https://mizugoveram.weebly.com/uploads/1/3/3/9/133986338/2606621.pdfIn PDF document text
    • https://lexilovomab.weebly.com/uploads/1/3/1/4/131452944/1582965.pdfIn PDF document text
    • https://danivuzi.weebly.com/uploads/1/3/2/6/132681213/tuvukepemabugo.pdfIn PDF document text
    • http://katipef.medianewsonline.com/fubivuxirozurutogapurorik.pdfIn PDF document text
    • https://likizosuzi.weebly.com/uploads/1/3/4/8/134886942/lidebejumizoz.pdfIn PDF document text
    • https://xuguxoxarakijob.weebly.com/uploads/1/3/2/7/132740494/bokij.pdfIn PDF document text
    • https://lodofimedama.weebly.com/uploads/1/3/4/3/134327961/sajalenaduxa_datonebe_kiwuwosivubidu.pdfIn PDF document text
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/00ebed77.pdfIn PDF document text
    • https://cdn.sqhk.co/sejejajoxej/iZVpst8/helix_jump_application.pdfIn PDF document text
    • https://cdn.sqhk.co/tizudukokeni/2jgtwe6/92752655300.pdfIn PDF document text
    • https://pabedowilopore.weebly.com/uploads/1/3/1/1/131163579/48d76541505.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/xubifupi/behance_free_website_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/mathematics_paper_1_non_calculator_2017_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/debamijizozexo/cozee_crib_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/joint_commission_report_a_complaint.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/acr_format_for_teachers.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/android_onclick_method_in_fragment.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/best_portable_am_fm_radio_uk.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_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 5772 bytes
SHA-256: 480d35d12fb53582a670f0094d455a2bd6a15ac21d62121f384411196ccfb842
font_01_sfnt_off00010159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11072 bytes
SHA-256: 3d68c1a15681fbeb40b4941485ac2b314d80c43f30ca7ad3810842ae7820f426

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