Malicious PDF — malware analysis report

Static analysis result for SHA-256 50834a4f4cabf31d…

MALICIOUS

PDF

99.3 KB Created: 2021-02-18 22:16:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 80e0e7f29815ed4bf5857e056b6d5bed SHA-1: 94abf1c0415a1f1a61b28d2fe6d49f3c941ce010 SHA-256: 50834a4f4cabf31d5d0b4d3f03bd547378c5b888f27adf2d5d512fd182dfe3fc
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is likely malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the embedded URLs and the ML classifier's high confidence score point towards a malicious intent, likely to redirect users to a compromised site.

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://baarspo.ru/aws?utm_term=how+to+make+sketch+portrait+in+photoshop PDF link annotation
    • https://cdn.sqhk.co/vopovaroxamo/WihiW9V/the_big_easy_ernie_crossword_clue.pdfIn PDF document text
    • https://cdn.sqhk.co/sejaganetaxa/ifjihba/vicarious_religion_sociology_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469837/normal_6008060a24078.pdfIn PDF document text
    • http://3gusevshop.website/what_is_the_difference_between_a_12_volt_and_20_volt_drillv3pz3.pdfIn PDF document text
    • http://legionmone.xyz/f1_car_race_today9zjrp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fd7dd903c51c.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/lagu_bintang_kejora_manado_coveroaiz5.pdfIn PDF document text
    • http://yoga-fitness.space/bovodzk6rz.pdfIn PDF document text
    • http://resimpub.com/alegoria_de_la_caverna_de_platonwfmue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424953/normal_5fe0a2497b601.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://momesesewoja.rf.gd/nursery_school_teacher_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/matilda_book_review_template.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 5256 bytes
SHA-256: 974827098563e3245607e10c5ed0878ca38a50e84f43b072f94823cb54c572cf
font_01_sfnt_off00014237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14237 12056 bytes
SHA-256: e4b0335887341239b299449a7ab3c6909f435412e1bb7d8b66f80665add0cd3c
font_02_sfnt_off00016ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE0 16104 bytes
SHA-256: de0df07cc1ef647ac548bb3a05c42ef2b1a336ae8e1c348ef4a0f46c621007a0

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