Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b841ea2e19d911…

MALICIOUS

PDF

74.9 KB Created: 2021-03-04 00:52:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a59c8bb82050efeef10ce84c71c6ab3f SHA-1: 8db1d8848cb8845d4500a9b46b89e151de514787 SHA-256: 61b841ea2e19d911bce01baf2fb4cc7023b7c56285200410a3c14791dc432a1d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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://dugedepap.ru/wix?keyword=aptoide+apk+download+ios PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4457561/normal_6012dd2ae7177.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fc92aa83487c.pdfIn PDF document text
    • http://jepoletas.iblogger.org/super_toss_the_turtle_apk_mod.pdfIn PDF document text
    • http://digitalcalakk1.xyz/pretty_things_tfdi_guitar_chordsjbznj.pdfIn PDF document text
    • http://toxixujisapibib.22web.org/30849595386.pdfIn PDF document text
    • http://mebets.xyz/unidades_de_medida_de_peso_y_sus_equivalenciaspneb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446147/normal_602c39ad8822b.pdfIn PDF document text
    • http://eslife.pro/beechcraft_bonanza_f33a_maintenance_manualfmolq.pdfIn PDF document text
    • http://kujamemapevubu.mypressonline.com/67411571735.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388065/normal_602c8a1983a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_600fcbce8abb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407724/normal_60358b8d38f6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://koburolamugalo.rf.gd/61990840138.pdfIn PDF document text
    • http://mupigedosawi.epizy.com/middle-earth_shadow_of_mordor_ranger_of_ithilien_trophies.pdfIn PDF document text
    • http://lisokabosexipep.epizy.com/vakerof.pdfIn PDF document text
    • http://gitipezusev.rf.gd/94169645540.pdfIn PDF document text
    • http://solukirakologi.epizy.com/alcatel_pixi_4_software_update.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_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 5000 bytes
SHA-256: fafde2405b469f9c8915efe488a93ef35d184aad68a3d72de6b3ea0498addfd6
font_01_sfnt_off0000fbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 10048 bytes
SHA-256: a200e31a6ba89779e4185e03e0dd21e2c21ec5ee3d8826c75b502f030616700f

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