Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9872d07029d710…

MALICIOUS

PDF

78.4 KB Created: 2021-03-18 20:20:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07470a68bfcd5a1cd01927710f7f9292 SHA-1: e99fcd823f308811104464a24d5d0277e07a5d2b SHA-256: 5b9872d07029d71060c54372ac7a510283d6206f9fa2bbd712c817362e90a78c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, suggesting a link farm or redirection mechanism to distribute malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document is designed to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=uniformly+accelerated+particle+model+worksheet+4+quantitative+acceleration+problems
    • https://gojatoxemoniro.weebly.com/uploads/1/3/4/8/134894745/abf90.pdf
    • https://cdn.sqhk.co/muruwake/JidO5h5/76079642942.pdf
    • https://cdn.sqhk.co/kajutizikodu/Mhcmuhi/meweru.pdf
    • https://jipunone.weebly.com/uploads/1/3/5/3/135349916/5862105.pdf
    • https://memefuzagimo.weebly.com/uploads/1/3/4/6/134612336/tufoluxaxoredi.pdf
    • http://7lessons.website/valentine_day_photo_free28gea.pdf
    • http://mmeueue.space/inventory_sheet_d_d_5edd2jv.pdf
    • https://cdn.sqhk.co/dojidavos/hjgRjgf/sufizuve.pdf
    • https://cdn.sqhk.co/xalibolopov/czlC164/53800405939.pdf
    • http://5dradio.ru/what_is_the_bolt_action_rifle_in_rdr2xr5l9.pdf
    • http://jadebey-x.com/15222530707ewue1.pdf
    • http://cyberlife.store/33316862715ddfsj.pdf
    • http://rajedat.iblogger.org/check_last_answered_call.pdf
    • https://cdn.sqhk.co/kovezozeseg/gigejhG/36907624032.pdf
    • https://cdn.sqhk.co/tifobebe/jStpVmE/audit_risk_journal.pdf
    • https://vanimiravupu.weebly.com/uploads/1/3/2/7/132710567/xivaziwusu.pdf
    • https://torufiwatus.weebly.com/uploads/1/3/5/3/135312416/5994407.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pimudovi.epizy.com/increase_self_confidence.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_off0000edce.bin
0eca910fed52ce7487fa467f0827d85b1bd8a1163000d4647501065425fe1230
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCE 6056 bytes
font_01_sfnt_off00010264.bin
ba39f6c8a44419e55ba40647f72ac083c76cca9b10813ffc9568ee246b5e5215
pdf-font-stream PDF embedded font (sfnt) at offset 0x10264 11416 bytes