Malicious PDF — malware analysis report

Static analysis result for SHA-256 76214670c29a8df6…

MALICIOUS

PDF

72.2 KB Created: 2021-04-19 12:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 325768d00d39084b327935b73fc5539b SHA-1: 23b41d716dc374d6c262b7b6973d5d11e5730d2c SHA-256: 76214670c29a8df6bff5f84ebb92a9013332ccf33fccf580b2334194cf93c1ec
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents hosted on different domains. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded URLs suggest a link farm or redirection mechanism designed to lead the user to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=how+to+program+xfinity+remote+to+tv+and+soundbar
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/bakenemesaju_wopafazosobejam_xifibifenomak.pdf
    • http://taher-tcac.com/bloons_td_6_android_freejig8f.pdf
    • http://narelavupes.22web.org/school_year_calendar_template_2019-_20.pdf
    • http://twenty-promo2020.ru/la_casa_de_bernarda_alba_characters_analysis2dxvf.pdf
    • https://masugofesobix.weebly.com/uploads/1/3/4/6/134656422/denazuf.pdf
    • http://movizopolu.medianewsonline.com/43261270652.pdf
    • https://cdn-cms.f-static.net/uploads/4393358/normal_6041e3b67a5f3.pdf
    • https://cdn-cms.f-static.net/uploads/4444102/normal_60290bf0c3400.pdf
    • https://cdn-cms.f-static.net/uploads/4487413/normal_602afe5e619b1.pdf
    • https://cdn-cms.f-static.net/uploads/4477873/normal_604ccf0f88484.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/aece4b8248.pdf
    • http://zijukikov.mypressonline.com/www._converter_to_word_online.pdf
    • https://nesilinazum.weebly.com/uploads/1/3/4/8/134886609/2325652.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c84afa32-3a18-4343-ad67-d94647153fdb/84043241634.pdf
    • https://uploads.strikinglycdn.com/files/3a94058d-d842-4191-931b-f9a6871826f8/1406009306.pdf
    • https://uploads.strikinglycdn.com/files/500b5644-80f4-47e4-9bf7-ea609741ed7d/84241894556.pdf
    • http://rebobimakefeli.epizy.com/candidase_recorrente_tratamento.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_off0000dcb2.bin
7bd83d751f9830cd70070da8f776ec0f33773a38e255dd657a4c64666becfdfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB2 5752 bytes
font_01_sfnt_off0000f053.bin
26cc854e9ee0809cb1f30ebecad18882b84f6e202a97bdad26e9457cd1678d01
pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 10340 bytes