Malicious PDF — malware analysis report

Static analysis result for SHA-256 39e90bd18cbe5abb…

MALICIOUS

PDF

80.5 KB Created: 2021-02-27 12:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6c1e891edf24a2495ffd36293afabf44 SHA-1: ed3d42b8444b0abda099fb079471425ecbc689fc SHA-256: 39e90bd18cbe5abb66f260843eb381b81bef6dfc68a935941303aeaa9075ac43
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing lure, likely leading to a second-stage download or credential harvesting.

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://bologen.ru/strik?utm_term=harry+potter+movies+spanish+subtitles PDF link annotation
    • http://dodemul.mygamesonline.org/buzexudolumenozax.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/rawujozosakozelugex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379489/normal_601718fba4aa1.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/41063695176.pdfIn PDF document text
    • http://fipizilemuwob.medianewsonline.com/2020_toyota_camry_xse_red_interior_price.pdfIn PDF document text
    • https://cdn.sqhk.co/potasuregoz/97Yhhja/the_battle_cats_legend_rare_tier_list.pdfIn PDF document text
    • https://cdn.sqhk.co/vejuwipem/gisgiAZ/7974445056.pdfIn PDF document text
    • http://wabukuxinezu.22web.org/blette_information_nutritionnelle.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/fxhck3E/papa_pear_saga_level_945.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488572/normal_5fed4d3185176.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/3921188512.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiliziv/jjeicja/dodgeball_duel_mod_apk_1._13._00.pdfIn PDF document text
    • http://gejudoxe.mypressonline.com/wojazowabotoviwebugun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xowobovu.myartsonline.com/how_to_do_an_internal_audit_plan.pdfIn PDF document text
    • http://moxurux.epizy.com/21250938413.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/are_sun_lite_campers_any_good.pdfIn PDF document text
    • http://woranuganavot.myartsonline.com/hamilton_beach_rice_cooker_manual_37506.pdfIn PDF document text
    • http://nimunofat.epizy.com/best_medicine_for_ischemic_heart_disease.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_off0000fdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD7 5324 bytes
SHA-256: d3ce807ff7de25fafbad666ab43bbc91f837310fba7b65576d293c26ef7cca07
font_01_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 10824 bytes
SHA-256: dad45bffa1870a1b59eca8fb9fee17f25271ceb55a38eb919841232112238ef4

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