Malicious PDF — malware analysis report

Static analysis result for SHA-256 556905e839c73855…

MALICIOUS

PDF

77.8 KB Created: 2021-10-05 01:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 023bb5814c49779a94096f597a221700 SHA-1: ded72e74810fa419a404a75469e02c9521ed9e87 SHA-256: 556905e839c738554b6265876ede96cdf6d8e2d1efa37c1dad3ee6cba6faedd0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The high number of external URIs, many pointing to potentially disposable domains, suggests a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://elsekmont.eu/userfiles/file/1968425144.pdf In PDF document text
    • https://phunhai.net/upload/files/9219924899.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/godiwutufepugilile.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/63492516408.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/rulewemir.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/pasulebit.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/12636574069.pdfIn PDF document text
    • http://x-mobio.com/upload/files/35821709106.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pekobamifi.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/zasodugogarezoginetedo.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/70980806668.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/vuwemafigugi.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/tevigisimewimiduwebexulu.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16154489c05a4a---36582877118.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/vulopusesi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c3021f631---tedaronenesak.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/latixenatuwejumubebajit.pdfIn PDF document text
    • https://slotsonline.ro/app/webroot/files/userfiles/files/jarifixijedamax.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/gijimojatomivaloxenenej.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/jedereredizatapemimaref.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/mosomolodutapu.pdfIn PDF document text
    • http://forti.in/userfiles/file/2914499109.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/zebuzefunukabup.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/fodiwoxenofodepizuraj.pdfIn PDF document text
    • http://dagvandearchitectuur.be/_files/file/30028698821.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210901_2EA3E94E5440CE7F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=worksheets+on+active+and+passive+voice+for+grade+7PDF 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_off0000c78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78C 17816 bytes
SHA-256: c201512975611b23289063dfbfe25a010e5531c454ad2fcf7ee7ed049b3b372a
font_01_sfnt_off0000f5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCA 11056 bytes
SHA-256: 1e3c80837d1555c37cb11111d3f9b45eca0272d985765025bc0cc4dca76dafcd