Malicious PDF — malware analysis report

Static analysis result for SHA-256 c22b49da8501a29a…

MALICIOUS

PDF

79.0 KB Created: 2021-03-22 11:14:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f658bd84fc3f58efe79bd25108992d02 SHA-1: 5a77fcc84f1f54a81ac5d9c1785ac20d043e45e0 SHA-256: c22b49da8501a29adf3df9330146ba4cc05545db940689181717aff547aaca2b
126 Risk Score

Malware Insights

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

The file is a PDF that contains embedded URLs, one of which points to a suspicious domain ('bologen.ru') and is flagged by heuristics as a potential phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing and trojan activity. The document body, though heavily obfuscated, contains text fragments that could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://bologen.ru/123?utm_term=product+costing+sheet+excel
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/6265aad61c9.pdf
    • http://rekijiwowak.scienceontheweb.net/fulezad.pdf
    • https://cdn-cms.f-static.net/uploads/4462362/normal_6027b4f21fed1.pdf
    • https://cdn-cms.f-static.net/uploads/4474988/normal_601029d5424a6.pdf
    • http://fisujerekuvij.getenjoyment.net/74206046531.pdf
    • https://jojurofi.weebly.com/uploads/1/3/4/6/134666092/kisatopanipagudag.pdf
    • http://worelimupuvefam.mywebcommunity.org/patezolukazapevebiz.pdf
    • https://mazegiwekode.weebly.com/uploads/1/3/4/5/134529082/9629963.pdf
    • http://sozapemogoz.mygamesonline.org/julebuxubujijupelupufagor.pdf
    • http://favodokoleti.mypressonline.com/68247708378.pdf
    • https://static.s123-cdn-static.com/uploads/4373297/normal_5fdf4da654a4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_3b9f6e3f49be4b7299c9813d96faf716.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e87a56e-6c86-40a2-a1bb-52820fb69cd7/58539597819.pdf
    • https://cfecb619-c0f5-418d-ae9d-b1147643389f.filesusr.com/ugd/4cd51e_5f7d4a9a07a948358a55f8d571e0dd80.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f7a92a7-b771-489b-95a9-69bc808bf62d/gp_medium_tent_army.pdf
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_0da859277c924a0c9e52c97c8befce48.pdf?index=true
    • http://diwadakerinepix.myartsonline.com/lapemerasukunodajo.pdf
    • https://uploads.strikinglycdn.com/files/a4d8492c-df52-40ed-9fd2-fcd6258252a1/92563526285.pdf
    • https://uploads.strikinglycdn.com/files/74fcdd34-7d0b-4a91-a3c6-56053d37b2b6/othello_act_1_scene_3_comprehension_questions.pdf
    • http://tiwatimab.atwebpages.com/que_es_la_historia_universal_contemporanea.pdf
    • https://uploads.strikinglycdn.com/files/41ebdf33-66a0-4404-8472-e161fa6025f1/9986261542.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_off0000f57f.bin
4a3d31a4cb9c764636f4a83bf2277388f4b4b78ee6fa7ce0752baace1a47550e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 5060 bytes
font_01_sfnt_off000106b6.bin
2c47f34c46c54249fa5298521f86b9e8bb35b5d5f4cdfeb17339575d79ee5b09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106B6 12180 bytes

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