Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d00245533d5faab…

MALICIOUS

PDF

66.7 KB Created: 2021-02-27 16:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c3b137001733546e44d1c7b1eb960a5e SHA-1: 3898dda040bf43a691e91316d78e3c4a4f84e11e SHA-256: 4d00245533d5faab2404ba554e22b4afd24c5a3c889c33f32475712cfbedd5f6
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one prominent URL pointing to 'jacksth.ru', suggesting a phishing lure related to product replacement. The PDF structure and embedded links indicate it's designed to redirect users to potentially harmful external 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=master+forge+charcoal+grill+ash+pan+replacement PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384836/normal_602d395c440e4.pdfIn PDF document text
    • http://jalakerag.22web.org/kenmore_elite_vacuum_cleaner_filters.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428054/normal_600c19d3dc66a.pdfIn PDF document text
    • https://cdn.sqhk.co/zexetiminav/jfijM3w/levagedevowijadalute.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5fd8bbc057d03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387817/normal_5fc5920a9bd66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_5fe0621069b4d.pdfIn PDF document text
    • https://cdn.sqhk.co/vavefamixivi/hiRja5c/sapupifuteloligurufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423154/normal_6038c8ee4c1d9.pdfIn PDF document text
    • https://cdn.sqhk.co/bamopilu/fiiJgjU/mindshift_backlight_26l_review.pdfIn PDF document text
    • https://cdn.sqhk.co/zapimafe/DibMy5v/26881735836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490251/normal_60183e3b2b286.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizijerupo.rf.gd/zonilusizadovadogavuga.pdfIn PDF document text
    • http://voxuluvaj.epizy.com/keto_diet_cookbook_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/polaris_high_lifter_1000_side_by_side_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/zajupixumilenotireman.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/tuvutufukapexemujup.pdfIn PDF document text
    • http://jiboleramar.epizy.com/39747462262.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_off0000c644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC644 5436 bytes
SHA-256: 062ffbec82f5f604ad0a416c9f8bb5bbe05074f03cbb38d9d5941408dd5a469a
font_01_sfnt_off0000d8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A8 10784 bytes
SHA-256: 3c05cb808d81fb78fff69b28c602d8d8838c66fd78c6457c239ff8382b7a58ba

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