Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f5d130b91113e5…

MALICIOUS

PDF

92.9 KB Created: 2021-02-19 14:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c10b29b53feec97adf505b283db711bd SHA-1: eb9c729829d9bd16a22960402e2b307233e4a678 SHA-256: 24f5d130b91113e5ed7e249b3800119715e49ae1153b98865c0e479c6c887185
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to 'penny stocks' and application metadata, which are likely lures to encourage user interaction with the embedded malicious links.

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://maypoin.ru/123?utm_term=penny+stocks+february+2021 PDF link annotation
    • http://50offstore.pro/pip_camera_photo_editor_pro_freeq51mx.pdfIn PDF document text
    • http://bbcua.site/how_to_rekey_a_new_schlage_lockrjeuc.pdfIn PDF document text
    • http://xeboxemovev.66ghz.com/ionic_half_equations_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6023dc070f956.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450864/normal_5fee32be9b90a.pdfIn PDF document text
    • http://kyhni.site/despacito_sheet_music_violin2cja8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460447/normal_5ff619967e014.pdfIn PDF document text
    • http://fusegufuw.iblogger.org/xepibalu.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/rikolesafuwofar/61887685168.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/nuwusekuxup.pdfIn PDF document text
    • http://gewevamaki.epizy.com/berusiborobetix.pdfIn PDF document text
    • http://godubaxedija.rf.gd/bc_sub_caste_list_in_telangana.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/quadratic_equation_definition_in_urdu.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_off00012a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 5476 bytes
SHA-256: b913df4139830e624bb350ea368fd7d1e23a4b2af92092fed63633672f4c7ddf
font_01_sfnt_off00013d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D49 12252 bytes
SHA-256: df2ccb80453132deca42f88dc698830ac94f3f3f437c3c64f37cbd71c0b310aa

Open this report in the interactive analyzer, or submit your own file for analysis.