Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4cec8c5aa61306…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 03:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 486ffa5cba8d5a9b84677e83439e1f6a SHA-1: 82c8af6b8420e6a23f4105427452fca25453f438 SHA-256: 4a4cec8c5aa613069048f80e7d9de31a1408c7c780ec4b50d93f17c54610d84c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, many pointing to S3 buckets, suggesting a link farm or distribution network. One prominent URL, 'https://baarspo.ru/strik?utm_term=kodak+easyshare+c813+price', appears to be a lure, possibly directing users to a phishing or malware download site. No scripts were extracted, but the PDF structure and heuristics suggest it's designed to redirect users to malicious content.

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 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.
  • 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://baarspo.ru/strik?utm_term=kodak+easyshare+c813+price PDF link annotation
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/larapogawufifilobumi.pdfIn PDF document text
    • https://tufanemoxidubux.weebly.com/uploads/1/3/4/3/134315727/kudoseliwuni_zobutizu.pdfIn PDF document text
    • http://pixell.store/gokasakovapowajunamen1dz7.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/7346423.pdfIn PDF document text
    • https://tenosufude.weebly.com/uploads/1/3/1/4/131455069/313b9b393921473.pdfIn PDF document text
    • https://dupukixulin.weebly.com/uploads/1/3/2/6/132681516/9d9cd14d369.pdfIn PDF document text
    • http://latuha.com/87081153255ncn95.pdfIn PDF document text
    • https://dodarumobite.weebly.com/uploads/1/3/1/4/131437296/7704234.pdfIn PDF document text
    • http://regsenatvumen.website/breast_cancer_thesismzgoy.pdfIn PDF document text
    • https://gidafefutor.weebly.com/uploads/1/3/4/0/134040883/kawetukedilo_zeziwamovukos_nugomerogop_vezabuwoj.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/simujix/real_bitcoin_miner_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/ritufuwuraresumofa.pdfIn PDF document text
    • https://s3.amazonaws.com/jajoxulabojaso/lapuponomenobiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/2463230791.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/badatodizev.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/aviate_launcher_pro_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/bubudulerabosejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/89323110672.pdfIn PDF document text
    • https://s3.amazonaws.com/fosalizuzu/49612052920.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A8 5676 bytes
SHA-256: 5b0a185a203227f4d458e9e3fb8a675b5cb506e0cc5fad4c7ff03fad35ee004d
font_01_sfnt_off0000dc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC04 10976 bytes
SHA-256: 7d5b2412df195e601c7edb032db634e78602577fdf62b9dfc30fdbcdbca1455e
font_02_sfnt_off00010119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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