Malicious PDF — malware analysis report

Static analysis result for SHA-256 bed57592e7529a7c…

MALICIOUS

PDF

77.7 KB Created: 2021-02-13 02:14:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7461de9c1d1762b0358a6d9a7a91435f SHA-1: 71fe5ac9523b10cefdbbc2360509c44bfa2fe3b4 SHA-256: bed57592e7529a7cb2921c4f6808ba3ab07c80018adb8853066797cfa09455b8
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious 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://bologen.ru/123?utm_term=gopro+be+a+hero+campaign PDF link annotation
    • https://cdn.sqhk.co/gegenosuzun/fidjbgi/best_online_iq_test_2019.pdfIn PDF document text
    • http://xaxikobovivo.22web.org/bixby_voice_apk_for_a7_2018.pdfIn PDF document text
    • http://silvanozito.online/18846554857lnk2c.pdfIn PDF document text
    • https://xesaranit.weebly.com/uploads/1/3/2/6/132696194/wuzadomewaz.pdfIn PDF document text
    • http://prizinsta365.site/bulisevipivazepevog6057.pdfIn PDF document text
    • http://mscgis.net/set_up_icloud_email_account_on_androidi2vrf.pdfIn PDF document text
    • http://movilatur.iblogger.org/mumoverop.pdfIn PDF document text
    • https://cdn.sqhk.co/dutebevon/ibMjhMC/35992728317.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/towuzunorifuke.pdfIn PDF document text
    • http://ujjjrrrrr.space/7_natural_wonders_of_the_worldfn9e7.pdfIn PDF document text
    • http://instup.xyz/albert_camus_plague_quotes7sbqr.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/8372239.pdfIn PDF document text
    • https://cdn.sqhk.co/pomorezolo/idAgjjb/wusoke.pdfIn PDF document text
    • https://xesinuvukuwufo.weebly.com/uploads/1/3/0/7/130776104/6195039.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/tobojelusiwi/frasers_hospitality_trust_research_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/calendarlabs_2019_calendar_template.pdfIn PDF document text
    • http://wuwepapose.epizy.com/64831356060.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/daxex.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/missing_angles_in_shapes_worksheet_ks2.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_off0000f004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF004 5308 bytes
SHA-256: 997a42c518f2c5460a761b7fbcb0ff5e5ad91e41485e734c6000ae8a15b91d16
font_01_sfnt_off000101ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EA 11328 bytes
SHA-256: 7bdf0292a31a59d037bd534a3da095f4f8b42ebcbcac4c9ab0ae98b40a1b6019

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