Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cfd1c2bbd22f29…

MALICIOUS

PDF

76.4 KB Created: 2021-03-17 09:16:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05e74b09c52b6b794163df4782ec0c0d SHA-1: 2c37f7c82d43fb362e3f70b1dc8b48ddc6bb32ba SHA-256: b5cfd1c2bbd22f29795b8f2cab334d1b53f810a13eeb6b062e98a3f68203b999
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, indicating a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=adda247+publication+books+pdf+free+download
    • http://toworugesolur.getenjoyment.net/38024080160.pdf
    • http://bixaxivajujojar.mypressonline.com/lenovekagarazo.pdf
    • https://cdn-cms.f-static.net/uploads/4370097/normal_603973f1cd831.pdf
    • https://static.s123-cdn-static.com/uploads/4484806/normal_5feb8a03e73ed.pdf
    • https://static.s123-cdn-static.com/uploads/4421473/normal_5ff011138d2f6.pdf
    • http://jizerigozigalav.getenjoyment.net/calculus_of_variations_gelfand.pdf
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fcd530564188.pdf
    • http://joxotowefi.iblogger.org/how_to_fix_a_mr_coffee_maker.pdf
    • https://cdn-cms.f-static.net/uploads/4376629/normal_6048d059988a0.pdf
    • https://static.s123-cdn-static.com/uploads/4419413/normal_5fc5f5e868adc.pdf
    • https://cdn-cms.f-static.net/uploads/4486765/normal_60175e436a4d4.pdf
    • http://goxezidoge.22web.org/pobakixibetoxumegemeteva.pdf
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5fefec8e7a44c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d85b1738-a471-4043-b59e-116b2bb794a3.filesusr.com/ugd/97927e_91587bee57bf4e96ad4f6ebb3faaf486.pdf?index=true
    • http://xepumobokuv.rf.gd/assessment_strategies_and_practices.pdf
    • http://kafopazam.epizy.com/puruwekewose.pdf
    • http://koluriv.rf.gd/hygroma_adalah.pdf
    • http://pugaperis.rf.gd/50874944717.pdf
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_4ef133ce4f0f4f81b695682b6dcb3ca7.pdf?index=true
    • http://luzoxone.epizy.com/similarities_between_prokaryotic_and_eukaryotic_cells.pdf
    • http://satawakerexe.atwebpages.com/1000_places_to_visit_before_you_die_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1f.bin
9792abc7196d42dcb5ef45bcf1fba9b21cf5a074131d832e2bd47fc2bbac1229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1F 5736 bytes
font_01_sfnt_off0000fdd0.bin
7bf4810d14cb9c37657228633e7608d7e88a23010a3a32ecc6c5e92421274164		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 11264 bytes

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