Malicious PDF — malware analysis report

Static analysis result for SHA-256 957b4adcd178e259…

MALICIOUS

PDF

76.5 KB Created: 2021-04-02 11:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: eca3d6f1851db8c34dccc2d3f26c5e59 SHA-1: 129fd1f134adb15d451d3006e90b4154956b658c SHA-256: 957b4adcd178e25972783aaf26f6433ab931b074fa8da73fc1a4e506cf4324a4
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 0.9993

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://midufefew.ru/123?utm_term=free+printable+september+2019+calendar+templates PDF link annotation
    • https://pijafure.weebly.com/uploads/1/3/4/4/134457855/709604.pdfIn PDF document text
    • http://begdas.fun/lujiza1yxo3.pdfIn PDF document text
    • https://luzulobopado.weebly.com/uploads/1/3/2/6/132681737/5685924.pdfIn PDF document text
    • https://jopokoguse.weebly.com/uploads/1/3/0/8/130874396/8c02fda.pdfIn PDF document text
    • http://disukikobofug.22web.org/1996_honda_shadow_ace_1100_carburetor_rebuild_kit.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408352/normal_5fccf35369662.pdfIn PDF document text
    • http://fejukoturig.medianewsonline.com/apache_kafka_1._0_cookbook_download.pdfIn PDF document text
    • https://bumekutuwa.weebly.com/uploads/1/3/1/4/131452846/35533.pdfIn PDF document text
    • https://falosaxosudo.weebly.com/uploads/1/3/4/0/134017699/15591b6a0b.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/the_crucible_character_body_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371020/normal_6003d7d568585.pdfIn PDF document text
    • https://nanupubixo.weebly.com/uploads/1/3/0/9/130969545/jezepopogesesafewem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421943/normal_5ff6d0a9e55f4.pdfIn PDF document text
    • http://cosmeteca.com/fepudenal84at.pdfIn PDF document text
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/zefijipuse.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_6053cc2a467d0.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/losimisu.pdfIn PDF document text
    • https://wipegozi.weebly.com/uploads/1/3/0/9/130969535/218799dd2f28bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_6016b339c65fc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vazavaxajude.rf.gd/bilinimadiso.pdfIn PDF document text
    • http://dexixikix.epizy.com/steve_madden_platform_sandals_near_me.pdfIn PDF document text
    • http://guriseb.myartsonline.com/banking_financial_terms.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/zolulo.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 5796 bytes
SHA-256: fe989fceff0a1723a804be83fcf6a4329d9d8beba28c31ac33e2176e42529019
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 9928 bytes
SHA-256: 0d0a951d8b4728651a5b4e0340a4f9a071c323d58f323d5ef3b1b47c835e9299

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