Malicious PDF — malware analysis report

Static analysis result for SHA-256 e895a99ffa3d3a74…

MALICIOUS

PDF

71.0 KB Created: 2021-06-09 18:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b8b35b2ae393f423b76bde3cc8bdc2f5 SHA-1: 3ed6f02525e083fd01f7d13a7cd9180497be2a2a SHA-256: e895a99ffa3d3a74bd5686501ddb2b46f8b67f186ce58b5956245cacb77fdd33
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to exploit users through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://garglob.ru/pbw?utm_term=lol+doll+boy+coloring+pages PDF link annotation
    • https://lefevelomisowub.weebly.com/uploads/1/3/4/4/134459897/tajejokasa-rudogenavoje-zurir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405197/normal_5fd74f36368d6.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/gikenit.pdfIn PDF document text
    • https://gawajofanobovap.weebly.com/uploads/1/3/5/2/135296378/9624228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_603e48d7e2c19.pdfIn PDF document text
    • https://rozemubopul.weebly.com/uploads/1/3/4/7/134719755/dupajudovavupo.pdfIn PDF document text
    • https://rugilebeme.weebly.com/uploads/1/3/1/3/131380811/posofiriteponujep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_602bfbaddbd47.pdfIn PDF document text
    • https://xewikoleruwi.weebly.com/uploads/1/3/4/8/134897031/wupapotewatex-seredozepux-zogafu.pdfIn PDF document text
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/zubawazimeg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/47ba6ce3-0f87-41de-b364-4fc11f5ad328/rogipejoxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b920c13-90c2-41f2-b657-dfa634900696/asp.net_mvc_4_vs_5.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/nixumegimesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/871cd815-1333-493c-a517-6361e26e5bff/how_to_write_an_investigative_report_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af55cbe9-ff48-425b-9c2a-63c4d8e2d9de/gre_quantitative_practice_test_with_score.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fe12809-31fb-431a-b56a-4a17694137ba/waziwuxapipolexopoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba466d7-512f-453d-9d08-8f2fc61d0537/lanajizolalumo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66788bfd-a180-4157-aac4-d813756c3607/37467519160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93693d4c-168c-4c8d-abe5-3967f58b9963/jane_the_virgin_signed_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67110897-1c59-42f3-831a-a2b0d075060a/pewdiepie_minecraft_world_download_mcpe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148b2789-0931-46b0-b5df-06231ae8b093/amtrak_california_zephyr_route_map.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144877278/abcd_2_full_movie_in_telugu_watch_online.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_off0000d6d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D0 5424 bytes
SHA-256: 25799f1a237acf00be762baf64130ef0f3f395bad91fab0ed1da8b04a57aeeca
font_01_sfnt_off0000e952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE952 11420 bytes
SHA-256: 1f81b0de393146ea78edc6e8616d858f4ce4c4b3024c1cf7b82837a1a32a1028