Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d583e50d6ee40c7…

MALICIOUS

PDF

68.3 KB Created: 2021-01-26 01:23:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 8674053a2c4000c26b3fbec177e76c98 SHA-1: 444d36570b45d1a6402ae176a62f38969a24d293 SHA-256: 4d583e50d6ee40c78d9fdb23d7cd58742e0f6ba2b9e4259a65de08e6147e4873
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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/aws?utm_term=all+star+converse+plataforma+bordo PDF link annotation
    • http://boost-shop.xyz/xowodudedutasadiluladb5lqn.pdfIn PDF document text
    • http://legiontry.online/34095701213rlm91.pdfIn PDF document text
    • http://siankaanmexico.com/vomaluxawekigjh6mb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408996/normal_5fed6ec91e784.pdfIn PDF document text
    • http://wokulorumal.iblogger.org/52947593637.pdfIn PDF document text
    • http://xunajoza.22web.org/avdhesh_premi_ke_gana_bhojpuri.pdfIn PDF document text
    • http://alkostore.xyz/29093241599ixyzr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446770/normal_5fdaabb2783d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382408/normal_5fd225a0a18fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380867/normal_5ffa86757f3b8.pdfIn PDF document text
    • https://www.solodeportes.com.ar/chuck-taylor-all-star-lift-ox.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wopari/chaahat_ek_nasha_full_movie_free.pdfIn PDF document text
    • http://zakivijojinikij.epizy.com/34909534291.pdfIn PDF document text
    • http://zikenonuto.epizy.com/daterangepicker_format_date_time.pdfIn PDF document text
    • http://jozolefifove.epizy.com/hypertension_guidelines_by_age.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/62450160858.pdfIn PDF document text
    • http://zasegusof.epizy.com/believer_song_karaoke_free.pdfIn PDF document text
    • http://bavosezema.epizy.com/car_driving_school_2016_android_oyun_club.pdfIn PDF document text
    • http://fosadexovoz.epizy.com/regovejaxafudekutidevufa.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/34458255901.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_off0000cda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA2 5488 bytes
SHA-256: 45fbf4dc3fda2a4dfe16ee8b249a73295ea5133336c9d8242d20632f43a05071
font_01_sfnt_off0000e03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE03B 10640 bytes
SHA-256: 0d7cfeb036b70ad989ddf04d37bf4c95747fe070bb7b0fb270ce4646847851c0

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