Malicious PDF — malware analysis report

Static analysis result for SHA-256 34105ba05a86ddfc…

MALICIOUS

PDF

82.3 KB Created: 2021-02-25 23:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 63e9791d17852f85b06c0b9c34f0e8fa SHA-1: d2fa28e891f8e9a9752f652b8f1bcde537dd932d SHA-256: 34105ba05a86ddfc4793dcd7c79cab62ab345d2f5033ac802703b64e70ea5fea
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains an embedded URI pointing to 'jacksth.ru', which is flagged as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

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/award?keyword=big+green+egg+xl+prices PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377400/normal_601d75461e1c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_6034fe7a3a2a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422894/normal_602d38e120aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5fca6c0e25adb.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/aTDzXjh/monster_trucks_2016_movie_free_download_720p_bluray.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381294/normal_5ff8ab8163772.pdfIn PDF document text
    • https://cdn.sqhk.co/lojulifuvuxu/ojbkkic/nintendo_retro_system_games_list.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/porapotuvanuxam.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/thaSgcA/chatham_emergency_vet.pdfIn PDF document text
    • http://zogeditel.iblogger.org/10924166886.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/famesexavenasefusi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460954/normal_5fcf098b65941.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bobupugarini.epizy.com/adaptec_6405e_treiber.pdfIn PDF document text
    • https://s3.amazonaws.com/makixibawumebol/18062968208.pdfIn PDF document text
    • http://sabozet.epizy.com/adobe_premiere_pro_cc_2015_kickass.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/zuxaxedorov.pdfIn PDF document text
    • http://lumosaneja.onlinewebshop.net/62373633240.pdfIn PDF document text
    • http://xibiwoziveva.epizy.com/pelivupapokelivagekemo.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/how_to_clean_graco_swing_cover.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DE 5008 bytes
SHA-256: 7de94e33c7af52d06d9651bfeaaff659990a680ceb73f42ea4b0163cacaa7496
font_01_sfnt_off00011607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11607 11068 bytes
SHA-256: 1a00b5f2a6c14f587718095e0bc1dd4ff9f8febcb63513e088e5009f29d83c1e

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