Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0effce4fa7c9e67…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 03:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44d1a8f55115e9f43720ec5991ed82e2 SHA-1: 97a33361d69f3c5a19a60c1bcd91d62cb70f9d11 SHA-256: d0effce4fa7c9e67ea4168fff6ded9bbef509ffcf0fd16459aefb83371603057
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDFs hosted on various domains, many of which are identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317f531fa3e---42639768565.pdf In PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/pokejosunovi.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/21353751622.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/76092790207.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/46107778522.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/7653620036.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/zigalanijolopujuwubasizub.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210901062613.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/98577511029.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/xixisusuzuxefoxowasoseriv.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/45377810556.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/95547583563.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/50039972633.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/38795942503.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161372a97a4761---15902789334.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/63665897598.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/6080002350.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/52392468410.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/muguwisorufaxagizupi.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/lojixetokemupasapuzever.pdfIn PDF document text
    • http://hueide.com/upload/files/vogaxuruzuta.pdfIn PDF document text
    • http://xsteelstock.com/d/files/87446637128.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/21288933878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=i+love+u+papa+quotes+in+englishPDF 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_off0000d386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 18232 bytes
SHA-256: 5a8f7440fb063b85d0bd82290ab2e5e45298a26dd259453467129429e5357e3b
font_02_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 10692 bytes
SHA-256: 973015c9166ae5f3e4c2c65c034cf736cbf61127f251e4aa289e308761c7a98f