Malicious PDF — malware analysis report

Static analysis result for SHA-256 8543eafbd135740a…

MALICIOUS

PDF

96.4 KB Created: 2021-05-10 09:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4ebfbd23f20d9791aa7d1ea35702f2f8 SHA-1: b04105ebe8ed16752d0bd909596a5c5b9082e47e SHA-256: 8543eafbd135740ad88af40465c2351e948e4858ef5ccb433dded9c9aea508b5
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high-confidence ML classifier and ClamAV detection indicating malicious intent. One prominent URL, 'https://dugedepap.ru/strik?utm_term=are+foot+spas+good+for+you', appears to be a lure for phishing or malware delivery. The document body, though heavily obfuscated, contains fragments suggesting it's part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=are+foot+spas+good+for+you PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490367/normal_6019b50a16c3f.pdfIn PDF document text
    • https://cdn.sqhk.co/zenegiwowi/hahhgg3/62310804021.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/nejos.pdfIn PDF document text
    • https://cdn.sqhk.co/xafemepino/iwghjfd/ruxugesuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5fff5bc6dc790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_601c6a315dd32.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384642/normal_5ffaca099a879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_60270ef5d5d70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387420/normal_5fd340ad1c57b.pdfIn PDF document text
    • https://cdn.sqhk.co/motanunika/0twijgc/tom_and_jerry_puzzle_jigsaw_games.pdfIn PDF document text
    • https://zugimawaxudal.weebly.com/uploads/1/3/1/4/131410952/4e548a07197d1a.pdfIn PDF document text
    • https://zafasasuk.weebly.com/uploads/1/3/4/7/134713251/4deed7ac.pdfIn PDF document text
    • https://cdn.sqhk.co/bisadidizi/eibrTid/developing_effective_interpersonal_communication_skills_in_the_workplace.pdfIn PDF document text
    • https://kepefiporewe.weebly.com/uploads/1/3/4/7/134704647/lopokuvitusulif.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/tjegjha/72519790625.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7482199c-4860-41db-9b2f-e35b51030c85/yamas_y_niyamas_la_tica_del_yoga.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/flower_of_life_pendant_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/aldehidos_y_cetonas_reacciones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973e1fa6-cab7-492e-b945-cf00e7028239/nuluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c2d1cb0-1d74-487a-8267-7330371d6f16/59974824858.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E58 4996 bytes
SHA-256: ff207590cee197cecf0f7ef2c285bf4ce5cc9a090c94dd8f59c5f4819a654caa
font_01_sfnt_off00013f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6A 11632 bytes
SHA-256: 27c50a8c065293599fad97149a68c4aee02569503d7fc3308c60135e0903b410
font_02_sfnt_off000165e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165E0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176