Malicious PDF — malware analysis report

Static analysis result for SHA-256 836f0abde10bbc67…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 20:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 55e1bc741a8ecc769dc9c268487c50f2 SHA-1: 1259b2e3225a7c6936e98003ad81b79891b4f749 SHA-256: 836f0abde10bbc679f3ecd2fc9876f9bd6287e1b574898d33a18d1a324d33f97
226 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. It uses a password-protected-archive lure. 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 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jottigo.ru/123?utm_term=baixar+pdf+gratis+em+portugues PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369160/normal_603e232cecf2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426972/normal_603abaa39982d.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_602992e4c1e1e.pdfIn PDF document text
    • http://fajujefa.getenjoyment.net/siletutumenixovetajigot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_5fdb75b007869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408595/normal_5ff5fe7190880.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/physics_in_hindi_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5fe83bcddb2e5.pdfIn PDF document text
    • http://luwogexejel.getenjoyment.net/57917017958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379984/normal_5fd61d5b0be1e.pdfIn PDF document text
    • https://cdn.sqhk.co/kufedefivuvu/hbVjcij/tibolalalekolikebuvovu.pdfIn PDF document text
    • https://lorotorerusut.weebly.com/uploads/1/3/1/4/131452969/9652487.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453885/normal_5ffdf7fba4e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482872/normal_60262ea6e02a2.pdfIn PDF document text
    • https://sufojise.weebly.com/uploads/1/3/0/7/130739234/vujalupopixoter.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/52a9814e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tomaxade/76583642099.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/burnham_gas_steam_boiler_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/80689472942.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/tj_yeldon_injury_report.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5444 bytes
SHA-256: fc1044c33785e087ae510b77d2ea179b3ae3d6f7c11cc7f118a9a19febb7ff37
font_01_sfnt_off0001085d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085D 12972 bytes
SHA-256: 6323e3101e9c9725ce50357e58ae52f17fadba9b515039893c4d76777c64eb78

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