Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3e993e0b1f515b…

MALICIOUS

PDF

88.2 KB Created: 2021-03-17 00:32:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: bd9901147ed447a9717121d3cd59d1e1 SHA-1: 7d59bf10a686c4b33f63e194475f3affa3480a2a SHA-256: ab3e993e0b1f515b1418ec09aabc503202c2dd3068bb2d668e8b56633685e3cc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to contain metadata related to PDF generation, but no direct user-facing content that would explain the lure.

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://botokaw.ru/strik?utm_term=campos+de+aplicacion+de+la+psicologia+industrial PDF link annotation
    • http://gitamoravazini.22web.org/guided_meditation_to_sleep_floating_clouds.pdfIn PDF document text
    • http://vehicleinsusa.com/d-link_dap-1650_wireless_ac1200_range_extender16git.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/kenmore_mini_fridge_settings_1-7.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/Liegeig/denozoperasubo.pdfIn PDF document text
    • http://abanca-electronica.com/security_guide_to_network_security_fundamentals_5th_editionikgj6.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/cadena_de_amor.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/hg0BjgN/republique_du_congo_foot.pdfIn PDF document text
    • http://wetikufuwigiwox.iblogger.org/49726070015.pdfIn PDF document text
    • http://vumonivaxozutod.mypressonline.com/29108453113.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/padosumifubobo/ludawaxebatinabenuk.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_a40494deba384f7281478b5b54124fd7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/lotesafafuviniv.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/76330861411.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_5a5f624b0f224fd5bb749cdb8a3adf4d.pdf?index=trueIn PDF document text
    • http://wodowepakimeko.onlinewebshop.net/judith_l.gersting_mathematical_structures_for_computer_science.pdfIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_ac9af80f15014ac69c576bd2d28e3342.pdf?index=trueIn PDF document text
    • http://karuserewojax.epizy.com/6.5_creedmoor_130_gr_berger_load_data.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/vevojilogiwebuzi.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/birkat_hamazon_sefarad.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_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 5300 bytes
SHA-256: 75fbfef68205d492c01c301e30fa9e166a71bae09415ebe71a330312b2842f2e
font_01_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 12420 bytes
SHA-256: 3346c86c03b46545dc50cd1a5c50eb23095ac5fc0349637c69b10300f8e902b7

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