Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca766d1a6dbc6cf…

MALICIOUS

PDF

79.5 KB Created: 2021-02-23 21:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5581def894a55a20b3c4e85630dc924a SHA-1: be8da044324267ee5da6b83cb882d7547641e953 SHA-256: 4ca766d1a6dbc6cfbe78dff50235b42cdecaedd16799cfb9312c3662971b67e9
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://jottigo.ru/strik?utm_term=how+to+eject+a+vhs+tape+manually PDF link annotation
    • https://cdn.sqhk.co/fafojipedul/aNvTgfl/35172843513.pdfIn PDF document text
    • http://ndfnasg.xyz/174023721912eab2.pdfIn PDF document text
    • http://daliadiago.com/star_trek_online_tailor_hackst5rz.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/driver_genius_full_megawp4ye.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/00Zx5wx/gavinosesativesevijezeto.pdfIn PDF document text
    • http://apsmall.space/mediamonkey_playlisten_mit_android_synchronisierenxm0xa.pdfIn PDF document text
    • https://tenewokuge.weebly.com/uploads/1/3/1/3/131379402/fodubanu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_5fe97e4d72eb8.pdfIn PDF document text
    • https://cdn.sqhk.co/totafeta/ggeYhf5/tevipunofejafawab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jajuzasalikirut/fizinivemufupixufupu.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/algebra_1_textbook_big_ideas.pdfIn PDF document text
    • http://pinogizege.rf.gd/wow_classic_leveling_guide_horde_undead_mage.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/zupawomazoposa.pdfIn PDF document text
    • http://sijisizaf.rf.gd/72943742294.pdfIn PDF document text
    • http://kuwexugebukutim.rf.gd/detarukitadojadunuletuda.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5200 bytes
SHA-256: 3dab6f4a9122c37ec2c3209acfc50beb6b5a1ee7127791d255954d5410adceec
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 10852 bytes
SHA-256: 1d3b990d640455b3267c41e4024bc9d64b704c44494ff0688f391735d7e6a21f
font_02_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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