Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9d5e23818a051d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-17 13:44:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b2c7b38f4b94f7417faefc94284a5c6 SHA-1: cd2bdf3ffa7b1681db3db3870a7463310502cec3 SHA-256: ab9d5e23818a051dbabc49e28843ff721a54120a877ddecb1e49c7b2af19a7aa
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://mezovuduw.ru/123?utm_term=movie+free+android PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4445337/normal_601a5bd177009.pdfIn PDF document text
    • http://bonifacy.site/30738044763pelq8.pdfIn PDF document text
    • http://blekrossi.ru/danube_cruise_guide_budapestbzw2u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_5fe8f5912a5d3.pdfIn PDF document text
    • http://new-leggins.site/62975518365ebult.pdfIn PDF document text
    • http://dreamingdeveloper.com/nonilaxalobadukubibsla93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_6049e86e5735c.pdfIn PDF document text
    • http://cashfree.store/suwevatinerejek3yu7.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/jufowokedunod/rrb_je_old_question_papers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3989625a-96d2-4454-946a-ff41609586c0/mesixizaru.pdfIn PDF document text
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_15b5dfb9da954e8a9d00e13dd47c3255.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca929368-7e98-45db-92e5-ed1c9431068b/dirt_devil_platinum_force_hand_vac_filter.pdfIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_a243f71e445c4621b99621580376d2ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8c2ee31-b7ec-4932-ab3b-64ca704ea6c9/27623675901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95c58658-44cc-4054-91cd-23961d32548e/51997478517.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_5b226c18c96e4407aa92fc67f3fa1e36.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3123e0-97f9-4824-8a9a-7031273cdecc/69989588427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/006c7734-c6d7-4cfd-8bf8-71abb03403b9/will_be_review_or_reviewed.pdfIn PDF document text
    • https://e8f98835-b194-42a5-b43f-fe2f29920dd6.filesusr.com/ugd/bf650e_05c5a156d3e4494082ee6c7e9f629f34.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/aws_cli_cloudformation_multiple_parameters.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_off0000f4cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 4756 bytes
SHA-256: 557d181cb1696ab296df6371e2d230f153612769b0206cbc013b918594c5bc7c
font_01_sfnt_off0001051b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051B 10920 bytes
SHA-256: c8b60b010d5469b7d66d3fbd5a25cf7b24f9bfc8c7cd51b70f456eb6234fba94