Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea9b64657c7806a…

MALICIOUS

PDF

82.0 KB Created: 2021-03-22 01:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 2afee1de4571566b69de5f711c1efd7a SHA-1: 53f3474200ad627aabde4623a5a9b42207beb33c SHA-256: 5ea9b64657c7806a416729d0309f9198fd0521e6d44014a115c352d7f89fb4cf
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 domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious 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://druttle.ru/123?utm_term=manualidades+en+fieltro+para+navidad+2019 PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/zinizisasumutedeze.pdfIn PDF document text
    • http://zazorin.scienceontheweb.net/didumedosirizu.pdfIn PDF document text
    • http://jujavekerubeko.scienceontheweb.net/2020_buick_regal_owners_manual.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/ti_nspire_student_software_price.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/jgfRjbd/mevezepazabogebimasu.pdfIn PDF document text
    • https://cdn.sqhk.co/malevevipali/8dYjjKw/era_sosial_dan_budaya.pdfIn PDF document text
    • http://rozujed.sportsontheweb.net/12432617082.pdfIn PDF document text
    • https://cdn.sqhk.co/bofimekowadu/djjghhb/uphill_water_slide_racing_adventure_game.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/uIifHif/79292917166.pdfIn PDF document text
    • http://vugekowuzujed.scienceontheweb.net/57674926917.pdfIn PDF document text
    • http://xutefizil.getenjoyment.net/fedobasokafekijox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://luregaw.onlinewebshop.net/margites_homero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2631f07f-eeec-4fc7-9172-070069f05e01/why_is_my_epson_printer_beeping.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afdfe74-d665-4842-b852-1bd251298d02/dewalt_dwx723_heavy_duty_miter_saw_stand_for_dw718_dws780.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/fufulununis.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/aladdin_hollywood_movie_full_2009_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c6616da-c4fb-4739-b0fe-895ca104d44f/92663882896.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_off00010014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10014 5584 bytes
SHA-256: aba469d3c211f30725f166b0164257bf22ce0873c8a0296a643be24b90b5dfc9
font_01_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 11968 bytes
SHA-256: d654df11a07a56d3f114b1a6ab1212db450fa907411518bdc297cf5ba10ee15b

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