Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c2b123832708bfe…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 14:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ffaf9e795f74fbd5893c630831f3b0bd SHA-1: c855311929f92a69276ce112b779a859b99d1e97 SHA-256: 1c2b123832708bfe9e50e9da78a385083bf71b84f96f9bb87d76d6fc1c2943e7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-heavy content, typical of screenshot lures. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://dongphat.net/upload/files/81868941293.pdf In PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10702428869.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/12947828335.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/kizivadibovikozoxa.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/xenomep.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/kafekosipogesom.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394788cbf1c---86259807662.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/26599398404.pdfIn PDF document text
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/51635129620.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/vuvepip.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/91513988781.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/25190475105.pdfIn PDF document text
    • https://questyme.com/userfiles/file/kojatedibabaf.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9e20b9499---jogibalasej.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/41804569495.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/7637787686.pdfIn PDF document text
    • https://fototipia.hu/files/files/tasudipokazubokukalomupoz.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-03/images/files/xesoxusepes.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/lojedukejuxev.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kejusiditanefoli.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/nurevikaxokuxagu.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/sixusetegigakasikov.pdfIn PDF document text
    • https://chineseclothingonline.com/File/fezutedotedido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=palompon+leyte+zip+codePDF 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_off0000afd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD5 14232 bytes
SHA-256: 863c8fe598466e437fdb75afcfa76e381f6335f6e847b41fe61f041d1bb0bdcd
font_01_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6F 10584 bytes
SHA-256: 8e1bb7378eb5eabb99f124abc6e14072fb6e3ab6fda3b6d3ac08e285262b1c63