Malicious PDF — malware analysis report

Static analysis result for SHA-256 963fc103bcb498d9…

MALICIOUS

PDF

74.3 KB Created: 2021-03-15 12:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec6a4d3b472a65146c9b88b4b3f0468d SHA-1: 3d497b4a1997d187e2495e90be5e572c08731d67 SHA-256: 963fc103bcb498d9a40e1c17878b2b53c98aabd190469729dfe4a3ab6b9dbf58
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable domains or potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/wix?keyword=literary+terms+crossword+answer+key PDF link annotation
    • http://nat-yoga.space/reflexive_verben_dativ_akkusativorr2u.pdfIn PDF document text
    • http://form-lnstagramverifiedbadges.com/24765096582lf530.pdfIn PDF document text
    • http://thechambre.xyz/7699171086017cpm.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/ifsidhe/86894805125.pdfIn PDF document text
    • https://cdn.sqhk.co/sosobita/2AJheo8/19866708509.pdfIn PDF document text
    • https://cdn.sqhk.co/reparepoki/HlYif59/wizididolugadafifad.pdfIn PDF document text
    • http://orbitan.fun/dutinezasakosi0lx1z.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ggrgd7P/dragon_snake_mustang_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/burexewejam/Zig2bie/entergy_new_orleans_fax_number.pdfIn PDF document text
    • https://cdn.sqhk.co/lasetipulos/6rNDuij/51691825119.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/zodawanuror/16738372591.pdfIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_29de25cdc4af403cb40cda15e8343e78.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17e350b0-c89c-4e58-8be4-5e5a84dd7f4a/el_alquimista_paulo_coelho_libro_completo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4abd5c3c-da05-4fb6-aa65-8d4c5c290797/81440508897.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_eb914dfa308b4ec19c7f759df8b44806.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/reguwujetagemosow.pdfIn PDF document text
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_833b6a10817c4008813873a9b32c7246.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7248752-9e38-4012-bb51-7532ecf65baa/sc_dmv_appointment_only.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a80c3af-5261-41d3-9bce-ab2650957d6b/86259555933.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_dffce51e8a6f41c7bfa41c6414e06c0e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/rode_wireless_go_with_videomic_pro.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_off0000e5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BA 5252 bytes
SHA-256: 04a3a4b26e59d72de4a494471ebd61ad277a167882341ac9204761db45f5a6d9
font_01_sfnt_off0000f79d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79D 10512 bytes
SHA-256: cc9b431a57f0b5eeab2a55c6946c0b281630bfb5652b8b85e8ca0154f02203fc