Malicious PDF — malware analysis report

Static analysis result for SHA-256 5603dec3e3ed2c52…

MALICIOUS

PDF

79.5 KB Created: 2021-04-21 04:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b90052b02e18875e5b5160d0f9c08bb7 SHA-1: fbb726b1071d1b7f512df044427f8b232dfa345d SHA-256: 5603dec3e3ed2c528a1b7f93927ac22270f7e77f9dc5b0d9237e83d9e3e69b06
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and employing UTM parameters, suggests a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains keywords related to 'US army reserve jobs near me', likely a lure to entice clicks on the embedded malicious links.

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://dugedepap.ru/strik?utm_term=us+army+reserve+jobs+near+me PDF link annotation
    • https://doladilaraju.weebly.com/uploads/1/3/4/8/134854069/fuzokiseratu.pdfIn PDF document text
    • http://it50life.pro/31342300577f98qp.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/alphabet_francais_majuscule_et_minuscule__imprimer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474465/normal_5fe4a096f0d97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5fecf5c236a52.pdfIn PDF document text
    • http://naturka.space/criminology_books_in_indiau2db4.pdfIn PDF document text
    • https://tedagenuv.weebly.com/uploads/1/3/2/6/132682668/a16a498b130e.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/aeronef_rules.pdfIn PDF document text
    • http://kersita.space/skiinfo_enneigement_ax_3_domaines71p8t.pdfIn PDF document text
    • https://rezodipegizosif.weebly.com/uploads/1/3/1/6/131606434/teforulajaxuver.pdfIn PDF document text
    • http://zutumufedige.getenjoyment.net/dog_man_first_book_read_aloud.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redifigikutusoj.myartsonline.com/calendario_2020_mensile_da_stampare.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac2f53f-29d7-4a34-9ea7-43bf5c0cf420/fallout_new_vegas_pc_mods_steam.pdfIn PDF document text
    • http://disoluje.myartsonline.com/10694794203.pdfIn PDF document text
    • http://titugol.atwebpages.com/87587608745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f65943a-760a-4d39-8313-27b968277967/xuwemologurubovigowon.pdfIn PDF document text
    • http://joberemig.atwebpages.com/9624203279.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/taclane_kg-175d_manual.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_off0000fa0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0C 5168 bytes
SHA-256: d0f4f61de1d0a566d340794909b8ddfa0abbc9e07acf54f89cfd3de45afef5ce
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 11072 bytes
SHA-256: bc1c0417f96ade6b65ab2581c95e289b211abf4275d53fb41a8ef4c1d4942047

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