Malicious PDF — malware analysis report

Static analysis result for SHA-256 726064d87753965c…

MALICIOUS

PDF

75.2 KB Created: 2021-02-27 20:52:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 5a91f5890bb062893cec38e654b14169 SHA-1: 5420840c8846521ef757080edf61befe58a96471 SHA-256: 726064d87753965cc62364a8d356dab9ffef77232a9adf28ab809788873bcf78
126 Risk Score

Malware Insights

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

The PDF document contains a lure related to job seeking, which is a common phishing tactic. It embeds numerous URLs, with one prominent URL pointing to a site that appears to be a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=how+to+get+a+job+as+a+usps+carrier PDF link annotation
    • http://xitawefavam.medianewsonline.com/el_conde_de_montecristo_pelicula_completa_en_espaol_latino_mega.pdfIn PDF document text
    • http://jisugun.iblogger.org/10967315582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_601f2aa9f2b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5fdbe9811a2ad.pdfIn PDF document text
    • http://nigoguno.scienceontheweb.net/which_is_the_best_book_for_gmat_preparation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_60371fd94432a.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/monififubivegikuvuzu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446166/normal_6003d207788fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kexobub.rf.gd/49192866274.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/artificial_intelligence_course_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/best_inshore_fishing_guide_in_orange_beach.pdfIn PDF document text
    • http://bilavefopu.rf.gd/wusomebamiwaveregesid.pdfIn PDF document text
    • http://xesesezaxemu.epizy.com/24198643743.pdfIn PDF document text
    • http://xilibosukotijob.epizy.com/95531796418.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/nupupow.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_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 5336 bytes
SHA-256: 95096197ba09bf655e9ee25ecb3805628801f30a3b1e4db557801d96ddbf69db
font_01_sfnt_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 11312 bytes
SHA-256: c7c209af35f17e2723a6107a3342ffc216c86c33872a74b9544018ce23fafdbb

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