Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c10b973bff89f2…

MALICIOUS

PDF

135.6 KB Created: 2021-04-08 09:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0666a84f3781b1f18bbd7a1af625d08d SHA-1: 9031781c5ef1c896391e4ae69546aca01b4bd317 SHA-256: 30c10b973bff89f2446061a52017170a9a9121d7d8d3591478a6585255d94a57
226 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, identified as a link farm, directing users to external websites. Several heuristics indicate suspicious and disposable hosting for these links, with one directly pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/strik?utm_term=2007+chevrolet+impala+for+sale+near+me PDF link annotation
    • https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/8148472.pdfIn PDF document text
    • https://wumetitazidizo.weebly.com/uploads/1/3/4/8/134885052/xotaga-bijexojometevo.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/banking_services_chronicle_magazine_in_english.pdfIn PDF document text
    • http://fc-aromat.ru/calories_in_taco_bell_nacho_fries_box5du7k.pdfIn PDF document text
    • https://zidivopopa.weebly.com/uploads/1/3/4/3/134373798/08db803dbb6.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/kokupizinj0o7.pdfIn PDF document text
    • https://zesalogerevuj.weebly.com/uploads/1/3/4/6/134684883/2ad691342.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/97418569120368tj.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/the_sun_is_shining_lyrics_elmore_james.pdfIn PDF document text
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/1f9952f0d.pdfIn PDF document text
    • https://zitidimesefe.weebly.com/uploads/1/3/1/6/131606065/riwibokuvewexajide.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/jolozidabi/devops_interview_questions_with_answers.pdfIn PDF document text
    • http://rijemow.onlinewebshop.net/kabiz.pdfIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_fc115d01a8704829913f82d15f7b922d.pdf?index=trueIn PDF document text
    • https://acbe2b0b-ee64-4eea-b0ce-372b1aa9cc7a.filesusr.com/ugd/4bcc67_cde5d91eeb4a44d783062851d1bcae7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/83575259747.pdfIn PDF document text
    • https://s3.amazonaws.com/bejikefowu/free_surat_al_waqiah.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/royal_betting_tips_vip_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/how_to_start_learning_artificial_intelligence_quora.pdfIn PDF document text
    • https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_1afff758de074fe9b05e48677ada78e9.pdf?index=trueIn 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_off0001d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D98A 5576 bytes
SHA-256: 621e3f406db371f753c713c361ef22d4015cb8e22835decfa5ce4f842ff13715
font_01_sfnt_off0001ec62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC62 10648 bytes
SHA-256: dd868d5f24213ba6c29c479bfe7eebb24413f07f5afaaa843d976b5dbc846eb4