Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0214cf79f13f6a…

MALICIOUS

PDF

85.4 KB Created: 2021-04-22 10:40:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d01797e6d3e9440bc3b22cfcc58d8171 SHA-1: 5e1c1afd0a15db77370f41164cc16a0d854dd2b7 SHA-256: 4a0214cf79f13f6acd517b4a1dcef9df404ded35c00cfccb239740ec75893d63
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9995

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://botokaw.ru/strik?utm_term=how+to+use+elgato+game+capture+hd+with+obs PDF link annotation
    • http://jolujunutido.iblogger.org/ppt_animation_templates_free.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/hdjjoUs/90929470685.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/iiiQNd0/49348942846.pdfIn PDF document text
    • https://cdn.sqhk.co/pugalaleluti/hiYiaib/95353772727.pdfIn PDF document text
    • https://cdn.sqhk.co/dubibuwa/hjgihiw/grass_cutter_service_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/gOBjIAh/lightroom_classic_update.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_3812163719f94a458520c451cbffbc3b.pdf?index=trueIn PDF document text
    • https://2c91b947-1dd8-401e-ae91-d595f2f75867.filesusr.com/ugd/0af078_ccf35827acf2488d9119006917e1d8f8.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_cb22c8f3fb68462a9937e285a5e8da7f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76531707-f007-4abc-9bda-02b3b35c1a99/72282156340.pdfIn PDF document text
    • https://32e47638-7206-44c1-ad53-5c6f9176402e.filesusr.com/ugd/e00742_f79ca3c1150042e3a9918f6a0e37ec34.pdf?index=trueIn PDF document text
    • https://788ae96d-7a4f-4726-91a9-07bb742fb3e7.filesusr.com/ugd/97aff7_4d7449266fc54deb98e49ad4f4400c9a.pdf?index=trueIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_02d149c9f1ad42ef8fe5eb5cb6489830.pdf?index=trueIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_db22ae287bf1427e82377d78edaa0082.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_a0faa65ac54a43aa9cf5c6208df1c419.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_52d475a691374a36b5f8e44ee6fc01ef.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e75f07a3-1eb5-4e01-a1bf-83fb5c0d9aad/femesagagokuwamag.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_04640719b14d4f70a2d241a0f20be0d1.pdf?index=trueIn PDF document text
    • http://xuraperen.epizy.com/shellfish_poisoning.pdfIn PDF document text
    • http://gaxufaxurawago.epizy.com/fuzuriralubisuxokolev.pdfIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_8e7388e8b42c43abbd2077fd9a1f44fa.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_ffefbabd7c1b475fb125d9a18ef2e959.pdf?index=trueIn 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_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 5680 bytes
SHA-256: f2e2f39d77ca5301d2a8d89d686f7371f1a0bd2628bb61ce3101fc4b5b9de8a1
font_01_sfnt_off00011688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11688 2296 bytes
SHA-256: 836d07bf4de78ee9cd16cba12dce2d1615a4cae1d8c1c1922146b0d46ad94d52
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 11212 bytes
SHA-256: ab52d8912eff97ff57a5190f976e1b58d70c7a154d835dafb5df9efb38e7340e

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