Malicious PDF — malware analysis report

Static analysis result for SHA-256 3397706ba5dcbb5c…

MALICIOUS

PDF

106.6 KB Created: 2021-03-20 00:58:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4910436d95d76aa105f282e6876e944a SHA-1: 9f29d97a8ef9b5483ed45a070d8d2a601518900e SHA-256: 3397706ba5dcbb5ce6e013397b7b4972f3ad992a1930a406340d8a91d206de6b
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://golowaki.ru/wix?keyword=5+de+septiembre PDF link annotation
    • http://nagesebaz.iblogger.org/hungarian_rhapsody_violin_sheet_music.pdfIn PDF document text
    • http://vobajujabu.mywebcommunity.org/37044202665.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411498/normal_60551fdfaf74f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381980/normal_601b85766626b.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/4533266305.pdfIn PDF document text
    • http://balifruit.com/gta_san_andreas_cleo_4_apk_downloadmj7c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_60223136f36c3.pdfIn PDF document text
    • http://creampiepow.club/how_much_does_directv_charge_for_lost_remoteyzydc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_9a6ce4c6f51c45d2a793a8aac0111061.pdf?index=trueIn PDF document text
    • http://zerujafulo.rf.gd/early_childhood_education_ielts_answer.pdfIn PDF document text
    • https://1a6defe7-92a0-4357-8a70-d3bce85d30c9.filesusr.com/ugd/385065_375e79e78e65440a98e83eec406bce2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujixus/apple_airpods_use_with_android.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/88961447752.pdfIn PDF document text
    • https://s3.amazonaws.com/zalisujezajaje/zekolinekavukerugitaba.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_7a29fb231ab44b3f8aacdae278c38544.pdf?index=trueIn PDF document text
    • http://lowazuxakosilal.epizy.com/lifusegik.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_d355cf284018440cbb10b5014fa05611.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_off000161c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C1 5032 bytes
SHA-256: 7f98f408776503dba5d69cd1b4ecea729af27a2b408c609192c21bcba994987c
font_01_sfnt_off000172c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172C3 14124 bytes
SHA-256: bdb91bf4a321db5efe042de68ef44cd8b0a6d926371ccd4c5213cf27910f165e

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