Malicious PDF — malware analysis report

Static analysis result for SHA-256 85e0c87e8092dc5e…

MALICIOUS

PDF

87.6 KB Created: 2021-03-22 21:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b09d13084d05e5f807f93c747b061d51 SHA-1: 57187ae9d59969088224c59ac66c9f80bdb813e8 SHA-256: 85e0c87e8092dc5e6aa62b0002bb38beb38f4abd4584604e0503a24e2c4c4b40
156 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 0.9997

Heuristics 5

  • 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.
  • 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://jottigo.ru/aws?utm_term=army+combatives+basic+training PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467601/normal_601d63f1799a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486745/normal_603b669550eda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402712/normal_5fed30f2d373d.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/aa505f0c-7df5-4ada-9eb8-b257e5ed0572/1849799707.pdfIn PDF document text
    • https://s3.amazonaws.com/loranoduzuja/gusofanetol.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/famous_daves_nutrition_facts.pdfIn PDF document text
    • https://s3.amazonaws.com/mipizaju/6357296214.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/61769878080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17283cb1-4cc7-422c-917d-1b03c57ca8f0/what_scrum_master_does.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/methylisothiazolinone_allergy.pdfIn PDF document text
    • https://77047a80-9f17-4504-a563-a097c25ca12e.filesusr.com/ugd/5c8b2f_481865825c7f4e30b7b6034e795343ed.pdf?index=trueIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_f4c0242a9619441597f542b5268a75ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/live_nettv_apk_latest_version_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/besame_mucho_cesaria_evora_free.pdfIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_522e79112c93424194795e0a3d37c716.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dalava/dapatonowinobejanid.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/tasexabuge.pdfIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_930c26a1bbd34fee9cb54558d1b75339.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_8db345df3f8040e3bbaadf3e4e15eff3.pdf?index=trueIn PDF document text
    • https://d52369c8-37f2-40d9-9d5f-d682b3b4a2e4.filesusr.com/ugd/6d5a7b_149d924da58b4dde9b99d1c60dabc013.pdf?index=trueIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_517f0cb0c9ba47f2b5d58b78a17108f7.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A74 5376 bytes
SHA-256: d989f706167d2d27ab734e5eed1da7f1c2aea0c3c48a79ef3a613e8cd2169061
font_01_sfnt_off00012cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB8 10988 bytes
SHA-256: 9dbb1a479c4b7ea53c3c829c1fc07812d085297e7db5044ef8a6cc64315be5b7

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