Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5c485e24adaf62…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 20:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7fc24362cb7368d5a7622ecb8700711b SHA-1: 30a7cca2d05bf9639094ce28c3727c90356a3972 SHA-256: aa5c485e24adaf62f3c9ee42b4c648cf94f3d95f3bfc7240002458356022b239
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs pointing to potentially malicious domains, suggesting an attempt to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, reinforcing the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://coretry.ru/uplcv?utm_term=pokemon+x+and+y+gba+game PDF link annotation
    • https://natatourism.com/userfiles/files/83740895322.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/33795202845.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/nejufoxage.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161374eca0052e---molesopafomup.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/90856312886.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/kalekeliruxupeva.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/4774511906.pdfIn PDF document text
    • http://gdgom.com/upload/file/210901215021082560umohk75ioj89.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/93517702768.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/zazekizawix.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/bekufofomi.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/sedenarukatexagokesewotu.pdfIn PDF document text
    • https://kapefashion.com/files/files/41188935018.pdfIn PDF document text
    • http://bubb.cn/up_file/file/bazowerilivixofepono.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcb36876b3---4133136926.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/27312763076.pdfIn PDF document text
    • http://praguetransfer.com/files/file/zadogadilojaxapasad.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/siduvakexudizepojare.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/zowifapasuvifejupuzija.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/fusodojezokerurip.pdfIn PDF document text
    • http://creationart.hu/files/file/dasoves.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/65517853925.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/94999778166.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/85098120544.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/20313838216.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/74502982449.pdfIn PDF document text
    • https://bdata.vn/upload/files/govolaxuliwunili.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_off0000b5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E0 10536 bytes
SHA-256: 3b295ee4af2cf31981584f24aa8c3092f6fa29877d3855533acd00e502dbf9d7
font_01_sfnt_off0000cdae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 15088 bytes
SHA-256: 1b38a5d775876f5bdd0ef6df656f2e9747eb5177156c6ba75a24b254620e54ea