Malicious PDF — malware analysis report

Static analysis result for SHA-256 0de7707744f4be24…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 01:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5199dc089e6f8a0854a455a7a8163d37 SHA-1: 554f401bc0926f91c5181df001483feca75e2d85 SHA-256: 0de7707744f4be2487213ba79300b2128cffb5d19e184f1d685abf83470b72a1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of embedded URLs, many pointing to disposable domains or link farms, suggesting a phishing or malware distribution campaign. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically indicates a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://crysiq.ru/uplcv?utm_term=automatic+scroll+apk+pro PDF link annotation
    • https://ist-lb1.istanajp.com/contents/files/xogarizu.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/dowerudela.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/7746223454.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/b367ae64ad008765801a801eab913897/83225195900.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161452cba0f4de---bizufigipuk.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///65524361034.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/tobatekuseriwilurinaver.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/wezinafunobomofetofi.pdfIn PDF document text
    • http://infoguard.ru/content/file/gezaviwires.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/17208907512.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/35871862226.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/17145304299.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/pafew.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/xirepewizevemi.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/72010225651.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/limajogake.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/rovidonibetivux.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64097325603.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/45076461448.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/39375323526.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/kutujiwaj.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/22450781478.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/bokinisajitubigiji.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/45995286588.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/wevoxanapoveri.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://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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 10472 bytes
SHA-256: cc8557a0be68f94812d21747ce809c26570301c79bbd1306e890e1fce843f2ec
font_02_sfnt_off0000dffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFD 15776 bytes
SHA-256: 7aa551fe199c7b7f5b48ff186c5a475b5a260845da81ea1b53d2e05009dd923c