Malicious PDF — malware analysis report

Static analysis result for SHA-256 884a3f84d2bda626…

MALICIOUS

PDF

77.1 KB Created: 2021-03-12 18:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 877b20b9912931196c690360d1ef7a2e SHA-1: d78333b39c622f7c1b51e29d70bc3a5aa711ac28 SHA-256: 884a3f84d2bda626074612ea84faecb5bca83b572ec77dba143af528bb356f40
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a spearphishing attachment designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=sharepoint+for+dummies+youtube PDF link annotation
    • https://digokevun.weebly.com/uploads/1/3/4/7/134747151/laxijo_bemep.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488855/normal_5fe5a9d8577a6.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/7524344.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/3347699.pdfIn PDF document text
    • https://cdn.sqhk.co/dojoxuwote/hcJgerk/datadog_dashboard_widgets.pdfIn PDF document text
    • https://cdn.sqhk.co/winexumalov/ha8Yjdz/2019_honda_accord_sport_manual_transmission.pdfIn PDF document text
    • http://gatowixipeba.mywebcommunity.org/fluency_rate_accuracy_prosody.pdfIn PDF document text
    • https://cdn.sqhk.co/libuzewis/hKyWygh/59365096694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456699/normal_6022d4a3ba150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_60096a3045d52.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/gcjh9hb/31398114382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464313/normal_6046c06e22374.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/13826658002.pdfIn PDF document text
    • http://sakepugikunon.mypressonline.com/83430592126.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/84687201200.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
    • http://jutemimiseg.epizy.com/arte_de_la_guerra.pdfIn PDF document text
    • http://rukojipunuwupur.epizy.com/papagidaw.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/kenya_2009_census_full_report.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/fuwixawagovipumat.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/pomebiwelikidusazejaxa.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_off0000e378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE378 5476 bytes
SHA-256: c5cc654df2d59148846875014435c336b0e426a039c8f881ab40f291ee029a13
font_01_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 10144 bytes
SHA-256: 7ec77129bd0a54947e578d4f00a8e566d676658b614c15f1ff48a197201eab11
font_02_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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