Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac49b0da9a817e4d…

MALICIOUS

PDF

75.9 KB Created: 2021-02-17 10:30:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 62326c73cb9e04bd8805d95a49593ec5 SHA-1: 7473566335301f92a1da908274559c571d984cbf SHA-256: ac49b0da9a817e4dcd610333c43f015de7c68abae1ce51325239bec81a22a215
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate the document's purpose is 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 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://maypoin.ru/aws?utm_term=the+hardest+questions+you%2527ll+ever+have+to+answer+reddit PDF link annotation
    • http://prazdnikprosto.ru/34079802686s72t8.pdfIn PDF document text
    • https://xominamoluz.weebly.com/uploads/1/3/4/3/134319977/wemazutepadep.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/divelikugid.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/nokapolopu.pdfIn PDF document text
    • http://trokot-new.online/12712009642kygsb.pdfIn PDF document text
    • http://prod-fruit.space/twrp_3._1._1-_0i7rx0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446166/normal_600e84104da25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fce4f002227a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6019a5630271f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_602c378c8e694.pdfIn PDF document text
    • http://rmk4sale.xyz/282669143739r4t7.pdfIn PDF document text
    • http://detonic-deutschland.website/zanazojonokhx6o.pdfIn PDF document text
    • http://whitetwo.space/manual_de_direccin_artstica_cinematogrfican8f1r.pdfIn PDF document text
    • http://ukrinsure.com/12015515370lhl1v.pdfIn PDF document text
    • http://topsale.pro/davidson_internal_medicine_cases3rnq3.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/remuv/transunion_credit_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/allotropes_of_carbon_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisi/sefuzufutojuv.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_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 5276 bytes
SHA-256: f025a65227c447d8ecff9610cb255c4daa54e29292b04a3faeedca67ea8e5de6
font_01_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 11132 bytes
SHA-256: 871664e6a6337732a818df973ea38b12aad16a589f45651631fda0bddff938b5

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