Malicious PDF — malware analysis report

Static analysis result for SHA-256 af899a475054e048…

MALICIOUS

PDF

78.6 KB Created: 2021-04-02 08:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0f482576ec5c3afd64d4c5a976294594 SHA-1: 8e579139d22307cde85784aaf1f49bc24ffdf382 SHA-256: af899a475054e048454ea15b26796d75378f5b5f783d84745e2efe7809a4f08a
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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=biology+dictionary+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501963/normal_5fd397bf9cbe9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_5fdc2cac8e932.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/29608120601.pdfIn PDF document text
    • http://duvejajenivogik.getenjoyment.net/21_cfr_part_11_compliance_checklist.pdfIn PDF document text
    • http://patedeziw.mypressonline.com/boserup_vs_malthus.pdfIn PDF document text
    • https://cdn.sqhk.co/mudemodox/ejdjjii/mizapapujurusuzuzapage.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/gijRWha/83246209642.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_602abb8682cb3.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/2pJ3ZpD/12493790900.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/lofese/14407790159.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_3096ed47c124446e98dc64605df047be.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lovetijif/android_studio_change_minimum_sdk_version.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_85550896a44a4b5baf50c8f2ecd7ea78.pdf?index=trueIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_5d19527811434598bcbd1753cdaa42ba.pdf?index=trueIn PDF document text
    • http://pikegasek.epizy.com/kutabijikovawa.pdfIn PDF document text
    • https://s3.amazonaws.com/fazujo/63991445637.pdfIn PDF document text
    • http://wokarodefi.onlinewebshop.net/fasuturukokulebokimudafag.pdfIn PDF document text
    • http://wopolew.rf.gd/fesejemewusimiziful.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/51170102317.pdfIn PDF document text
    • http://wozawexopad.epizy.com/sanonomikadipalirefip.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_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 5388 bytes
SHA-256: b2d2c6788155e7012d2984e9ec28bb6efdeb6f5c4c3c64b81ebd93c7b76752b6
font_01_sfnt_off000107dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DC 10948 bytes
SHA-256: 4e0783133d28b789014248b1de9ac4c2050eda853a733c974f87f827f07603fd

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