Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba0d70639c25b989…

MALICIOUS

PDF

88.9 KB Created: 2021-10-28 02:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9a6e31d0fd39af8116a17e68c2622ad9 SHA-1: c31240431c4e107c333b55ea79c49c5e73086015 SHA-256: ba0d70639c25b989cc38bd919d7a3562332a3a66871dfe181470de8e70fed137
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a callback phishing lure. The document body is heavily obfuscated, but heuristics indicate it's a link farm with numerous external URIs, suggesting it's designed to redirect users to malicious sites. The presence of PDF-specific rules and the overall structure point towards an exploit embedded within the PDF to facilitate further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=nicole+real+housewives+of+cheshire PDF link annotation
    • https://proxus.nl/file/rabifuriporoxudegizaf.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/peful.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/gafenuwerigowemovitarir.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/27799212803.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/zoxusurakebotewis.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/26764733159.pdfIn PDF document text
    • http://dsfly.com/uploads/files/lelajut.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/nugaluf.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/togobuxakebit.pdfIn PDF document text
    • http://bienbao.net/uploads/files/6916221677.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/vonuvuxoxabutekodejofuze.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/voneruxepewexuluvezenulam.pdfIn PDF document text
    • http://support-cmu.com/filedata/file/8043884818.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guwumafawasutolako.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a02d1f5e4f229a253041532fb87a8b57/15526617875.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/21423300864.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/16269710200.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/telinaguvijezejavela.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/4a4707b2558bada8bc0a74c227b18011/16708732314.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/88295341704.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/78930524968.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/fifekagugusomexemo.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/54389397031.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/vaxogaxidezitotujivowuku.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/zuliletebedalamib.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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 10460 bytes
SHA-256: ff3f2781c84be4a1fd61c33322bd17fba4457d35b2fcd760515d3303a96a1564
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12220 20112 bytes
SHA-256: d05aaa5f3d924744d84378a4ef7740cb72d83a5bc95646afc15926fa08a3044b