Malicious PDF — malware analysis report

Static analysis result for SHA-256 2771d9416c020495…

MALICIOUS

PDF

78.1 KB Created: 2021-03-23 11:26:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: cc1d4553b44f7a132ffde341b9e02a28 SHA-1: d7e454d411d58b9d61555192ee531113c757d5c5 SHA-256: 2771d9416c020495fec9d81d684ae2eb9762eabbd1d94d0cf92bdaff6162252f
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to disposable domains and link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the link farm suggests it serves as a distribution point for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=painted+d%2526d+miniatures+for+sale PDF link annotation
    • https://cdn.sqhk.co/nodujugebi/ahjzigz/5931641223.pdfIn PDF document text
    • https://cdn.sqhk.co/waxipefimafa/mOihWhf/nipiwori.pdfIn PDF document text
    • http://lokotahas.ru/cvs_wrist_blood_pressure_monitor_error_codes_e5sqb9r.pdfIn PDF document text
    • http://rawenspant.online/tofuvio8tql.pdfIn PDF document text
    • http://vbruti.site/tipifizigemexdsg5.pdfIn PDF document text
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/8ef72aabf60e.pdfIn PDF document text
    • https://fiwozipuwawew.weebly.com/uploads/1/3/0/8/130814157/9820517.pdfIn PDF document text
    • http://dombitarf.ru/apeman_a77_manuale_italianopgno3.pdfIn PDF document text
    • https://pudabesipewoz.weebly.com/uploads/1/3/0/9/130969441/pigelazizukavolerupe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://texavit.epizy.com/endeavour_series_1_episode_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/368bf922-49e4-4fa5-aa3d-8f888605c528/giredifulafa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bd5083d-7349-478f-b7b9-c7fc3113d72a/zigilirarikep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4056a64-3474-4f12-8b12-afe1bc764030/latin_american_literature_novels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4d851b-f662-43d4-b55a-0a90ad7d8d05/probability_worksheet_class_10.pdfIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/93417432745.pdfIn PDF document text
    • http://tesitanine.rf.gd/sacroiliac_joint_x_ray_report.pdfIn PDF document text
    • http://tozemuj.rf.gd/jupizilop.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/rumohra_adiantiformis_po_polsku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53fa31a8-e132-4fdf-8581-fe2dad811d5e/lowes_foundation_grants.pdfIn PDF document text
    • https://s3.amazonaws.com/gurowozenupifi/bootstrap_3_search_form_template.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_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 4516 bytes
SHA-256: 0f8dd6085f758c32cb56d246d34c6210bf1394617b84425a45a8e785ce8ffd65
font_01_sfnt_off00010705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10705 10636 bytes
SHA-256: afade4358144e100fcf388eb20fab67af06f431302a6d1c41ef688dbea0d1974

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