Malicious PDF — malware analysis report

Static analysis result for SHA-256 674b7f0f1c3cb360…

MALICIOUS

PDF

88.6 KB Created: 2021-09-21 00:03:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3b6fedeb675e7f919a71b61aece30f0 SHA-1: 15d5433ad523792600c38c0762d933080ba19b95 SHA-256: 674b7f0f1c3cb360f4548ff66996a62a6dc910709af01f2195a1429b418dd6a2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, including one that appears to be a redirector for a file download lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure malicious links within a large number of seemingly unrelated domains. No scripts were extracted, but the presence of multiple external URIs points towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=dragon+ball+z+fighting+game+download+for+android PDF link annotation
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/vokopodexixavedax.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/83108859974.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/92521634270.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/rexupukatewaxe.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161470653d7e95---posolaborewowuzevax.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/midokamaziratefo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161364b02c8b07---raxitusigazimuguxubese.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109060546481910.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/9642307249.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/56103747046.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/kilepezagojowosisidaker.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/74499244877.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210919_36ABE54418469C7B.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/87795586347.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/fijofefewubopugo.pdfIn PDF document text
    • https://autoskola-scp.com/files/zanisokakejabuwakik.pdfIn PDF document text
    • https://go2germany.ru/files/file/87677540977.pdfIn PDF document text
    • https://saigonservices.vn/images/uploads/files/31447871973.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/52708208733.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/robegaxiriweza.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/92519202813.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/jamirusetalar.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/zitapulagejefojupimexige.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/55411663023.pdfIn PDF document text
    • https://lapdonline.org/file/24753151358.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_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 18512 bytes
SHA-256: 9ed42cc81c1827cfb1b53ca7f516bce8d10b2fb133ac61652db643c15ccdc029
font_01_sfnt_off00012317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 10920 bytes
SHA-256: 8cb5f0981eac12827ae60caa8e0c37eba792aeb87199b4956576f9324d837fb2