Malicious PDF — malware analysis report

Static analysis result for SHA-256 d330bbb01dd31a22…

MALICIOUS

PDF

93.1 KB Created: 2021-06-10 19:34:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a7985265ec1fa2ab459e363271395dbc SHA-1: ec91a65388378515c26ddaaa0e1c250f330504e4 SHA-256: d330bbb01dd31a224a3a6dac56d594a927d018528a18fe77790fa3d6e4d02cbb
186 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 0.9994

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://allytemp.ru/pbw?utm_term=all+the+characters+in+super+smash+bros+ultimate PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4491164/normal_5fe560d318cab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_6027256ed9c13.pdfIn PDF document text
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/103933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527042/normal_60494dd51a9ab.pdfIn PDF document text
    • https://bisuxijux.weebly.com/uploads/1/3/5/3/135323954/933973172dde27.pdfIn PDF document text
    • https://jijelejo.weebly.com/uploads/1/3/4/5/134590633/896f17eee7b8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473654/normal_5ffcce9c1f88e.pdfIn PDF document text
    • https://luxiwejewukon.weebly.com/uploads/1/3/0/7/130738755/52194f5c89e.pdfIn PDF document text
    • https://dekewojevor.weebly.com/uploads/1/3/4/1/134132084/tupazekoxinubolofox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369498/normal_606e41321a982.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401691/normal_5fcc2a542808a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393022/normal_5ffd9bc62d3b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5ff57de9881c1.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/522d1c44-ed2c-4029-b2eb-89ac00e9bd39/among_us_mod_menu_always_imposter_download_2021_-_always_imposter_mod_menu_apk_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c89e2d1-09a3-4bbe-8437-8b5849c8b71e/80755106431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa7a23c8-0a2e-4c92-bc7f-077d268f9fdd/87620195755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f0e0ff1-5677-4430-9410-5184fa60ea6a/t-fal_25-in-1_pressure_cooker_-_6_qt_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/068bb3d8-0976-4bad-953c-3d8b7686efa9/tidurawimuvifot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0fb0a59-fa9e-4e7f-a1bd-9d0b44b19c57/ruwigokizigemure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73e6156e-ff08-4bd6-8d0b-3fed6442346c/emily_dickinson_complete_poems_amazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2af6182-f3d9-45d3-8f8d-56e11971b318/behind_closed_doors_movie_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1f74296-0db2-499f-89c3-39466c330be9/69731740696.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 5468 bytes
SHA-256: 20a228961859eae9f9d88743ad50f4c758d3fc578f17e51d15bb46c4bb992b8b
font_01_sfnt_off00012b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 5300 bytes
SHA-256: 18955edb4e4b26d0980b2c6d359e66a7d56075011eb796d6820e0e219f5c3cf4
font_02_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 11556 bytes
SHA-256: 573fdca0ea7acf5d57738c670497b37d285ac75660e55f6074fd185340291b88