Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a27c39f93b1347…

MALICIOUS

PDF

71.9 KB Created: 2021-06-06 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e8700f22b738aae7ab6462bd16ae005 SHA-1: 7ad4ca5cff0f7c61bb30862d1d69813faec4e638 SHA-256: e5a27c39f93b1347a583f27246daca84661f98f8ff89493a9b206efafb2b09a5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, with the primary suspicious URL being https://archism.ru/pbw?utm_term=gloomhaven+mindthief+card+guide. The presence of a PDF link farm suggests an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/pbw?utm_term=gloomhaven+mindthief+card+guide
    • https://cdn-cms.f-static.net/uploads/4368478/normal_600c7a47944be.pdf
    • https://cdn-cms.f-static.net/uploads/4372967/normal_5fd31099b97b1.pdf
    • https://cdn-cms.f-static.net/uploads/4489257/normal_605b86a91d089.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_60367be3e0138.pdf
    • https://zofigaxukinepir.weebly.com/uploads/1/3/4/2/134235574/toxir.pdf
    • https://cdn-cms.f-static.net/uploads/4444386/normal_60465f51c7d65.pdf
    • https://makodute.weebly.com/uploads/1/3/4/6/134649936/fupege.pdf
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/4491423.pdf
    • https://cdn-cms.f-static.net/uploads/4403814/normal_6058fbb9c2a6d.pdf
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fce9be177222.pdf
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/fuvituxudizagil.pdf
    • https://static.s123-cdn-static.com/uploads/4425728/normal_5fe05f7b0a406.pdf
    • https://static.s123-cdn-static.com/uploads/4449405/normal_5fc9a0163329e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e5ccafc0-7400-41a0-8599-00198f2967fb/where_is_bluetooth_button_on_zagg_keyboard.pdf
    • https://uploads.strikinglycdn.com/files/7f9207b0-fbe6-4840-8a76-5490bbed25f1/ingenuity_portable_swing_assembly.pdf
    • https://uploads.strikinglycdn.com/files/0cfc5779-efac-451f-b904-3b3d402df133/senabasajizikevujelopup.pdf
    • https://uploads.strikinglycdn.com/files/d8c99615-2898-4c5f-93ab-dc9fa594ada8/powershift_book_daymond_john_reviews.pdf
    • https://uploads.strikinglycdn.com/files/4de093ce-e684-4a89-840f-d6747c6799a3/why_is_it_called_a_california_rolling_stop.pdf
    • https://uploads.strikinglycdn.com/files/937bfda1-b6f7-40b8-8cc6-fe268ef3bc86/bosepof.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2e.bin
a9834c3896132ac26bc7055a812a4a766d49d047a00144395c27da075a752890		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2E 5348 bytes
font_01_sfnt_off0000ef3e.bin
a426dc01ced4b070471ac964448748eb7fc917a04ac4155105bbece016d7d885		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3E 10508 bytes

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