Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4787604cc2a223…

MALICIOUS

PDF

82.3 KB Created: 2021-09-21 03:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 588fdc6ca5e4a49d147995aa458dd7c5 SHA-1: baf642a1c3db4a3d9d51ab795fc85d612a65d6d1 SHA-256: bf4787604cc2a22379d477b0e252a263a1bdd75db511f1fca2524a340ef4af25
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to unknown domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_URI heuristics indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://csp-pub.com/stockages/files/ruratizexe.pdf In PDF document text
    • http://www.zywawiara.pl/pliki/10165095445.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/63374805640.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/fugerixatixisubagufopemus.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210917034340.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/jigeworemokibu.pdfIn PDF document text
    • http://industra.sk/userfiles/file/xetazezetuwikirobikarut.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/zumasadakisanidad.pdfIn PDF document text
    • http://prograsifkalip.com/files/51025899070.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/rixelijotikivisiri.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/71737277674.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/xibevumalojebapugiruw.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/zexanaromepeme.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/63891350135.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/gonored.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/nawogofat.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b55382f30---tijux.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/61448053152.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b917557ec---63453935952.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/24345758025.pdfIn PDF document text
    • http://cutskytools.com/d/files/91807353451.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/regage.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/79503436859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=torrent+streamer+androidPDF link annotation
    • 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://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_off0000de03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE03 17828 bytes
SHA-256: 4a33900de12a4457d61f3d77e10c92bd6480499991ba2f0d0529da10ad25352d
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10324 bytes
SHA-256: 62eaf7c339416394dc622bc958579b8582deaf09f03ada0d0280f1c5c220cbba