Malicious PDF — malware analysis report

Static analysis result for SHA-256 52a284e757bb9641…

MALICIOUS

PDF

78.2 KB Created: 2021-02-22 07:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 2992b77dde1b776c629c5b032fd4cef4 SHA-1: 28db00e070af19905ca99f45e0eb41c28528bab2 SHA-256: 52a284e757bb964120dd43b4581ffc4ea2236020e888a1dea28e9c8dda7cf658
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable hosting and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed 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://jacksth.ru/strik?utm_term=who+builds+craftsman+snowblowers PDF link annotation
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/7c1d8794970.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/bokag-gedalujuvozi.pdfIn PDF document text
    • http://price-list.moscow/hoops_walter_dean_myers_audiobookcmr5o.pdfIn PDF document text
    • http://circleshtang.xyz/3ds_emulator_for_android_apk_with_bioscn6pn.pdfIn PDF document text
    • http://lessonsonline.site/touch_of_class_promo_code_2021lgvce.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/ZGjjjd8/arena_novel_fandom.pdfIn PDF document text
    • https://mirijanonukuzo.weebly.com/uploads/1/3/2/7/132740352/zusekizina.pdfIn PDF document text
    • http://natgood.space/641653990922hlbe.pdfIn PDF document text
    • https://cdn.sqhk.co/daxegajok/HHhcibE/nuclear_war_treaty.pdfIn PDF document text
    • http://policyhelpcenter.com/19938866010ywa6.pdfIn PDF document text
    • http://argo-tourism.com/53789845639ny0f6.pdfIn PDF document text
    • https://tediresul.weebly.com/uploads/1/3/5/3/135345321/mipekabam-zisuxewo.pdfIn PDF document text
    • http://xplaintome.ru/where_the_red_fern_grows_accelerated_reader_test_answers34grn.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/gedesisumi/92920436229.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/63137874221.pdfIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/2018_camaro_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/cowin_e7_pro_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/magazine_design_template_indesign.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_off0000f5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DA 5504 bytes
SHA-256: 56d178d2de48f446a77e18606348e55c6b5636230b91a950d82c4935b09360cf
font_01_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10300 bytes
SHA-256: 3c867240a78fb7965c323bcecc58387bf98d1e3d76075a8f9822d627967fbc35

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