Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ab6cd6c336e496…

MALICIOUS

PDF

74.1 KB Created: 2021-05-09 02:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a90bd1385b6afeb969d8d798cd91d48c SHA-1: 981f33b0afc355ed834787169c9ad32834ad8f46 SHA-256: a7ab6cd6c336e4968873fbfaf4124a5d9ce9e4576d6c50b645a4a7dfefe57e9e
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://pelibifir.ru/strik?utm_term=what+is+the+theory+of+evolution+all+about PDF link annotation
    • http://pojapusevipuzu.mypressonline.com/72655312631.pdfIn PDF document text
    • http://xabusiwidurej.22web.org/xizewup.pdfIn PDF document text
    • https://zosixilerav.weebly.com/uploads/1/3/1/8/131856356/0d7eb8780df.pdfIn PDF document text
    • https://vixalabalu.weebly.com/uploads/1/3/4/3/134396729/novaxuwonoxusojuvelo.pdfIn PDF document text
    • http://dufifudusimube.mygamesonline.org/bikakulap.pdfIn PDF document text
    • http://lafuvenilimagi.iblogger.org/xofurobe.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/sijukapefabowutojise.pdfIn PDF document text
    • https://setupazaz.weebly.com/uploads/1/3/4/7/134772318/zaziges.pdfIn PDF document text
    • http://tuwuviji.iblogger.org/acrobat_reader_dc_free_windows_7.pdfIn PDF document text
    • http://nanewak.iblogger.org/acute_coronary_syndrome_management.pdfIn PDF document text
    • http://beviluxenumiliv.mywebcommunity.org/rotiwamoxerel.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/feliso/17721129837.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_e59c57f9170940709c51e97d1c8229c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/assamese_song_2019_mp4.pdfIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_e453a2fe886643c9a14f5a3284824e57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/accessibility_service_android_example_github.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/interim_financial_reporting_manager_jobs.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/lebeno.pdfIn PDF document text
    • https://s3.amazonaws.com/pekatikisuruki/acer_aspire_one_532h_2588_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/bise_gujranwala_paper_rechecking_form.pdfIn PDF document text
    • http://zasufogokalo.rf.gd/gotudimo.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/chest_wall_deformity_treatment.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_off0000e5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EB 5168 bytes
SHA-256: 15bbc7c3404aa2c1c3c4b21f8990b45167f3be31c255b2a7500388a47e291c5a
font_01_sfnt_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 10324 bytes
SHA-256: c4494e1ecb6ca2b1006111727c065848b2e214265682f4fbcb884db01a999b64

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