Malicious PDF — malware analysis report

Static analysis result for SHA-256 4128d9af2adee677…

MALICIOUS

PDF

72.3 KB Created: 2021-01-21 00:42:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9cdc7211707670cae7c021cbb3a07d92 SHA-1: db7c0f775d1517942250a24d2f295e0e88291328 SHA-256: 4128d9af2adee677228752f0acc7e250b078209bb0fef51453b0faf5ee4608f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a 'link farm' heuristic. One of these links, 'https://jottigo.ru/123?utm_term=ain%2527t+got+no+home+ain%2527t+got+no+shoes', is flagged as an external URI. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=ain%2527t+got+no+home+ain%2527t+got+no+shoes PDF link annotation
    • https://cdn.sqhk.co/vizinifum/ggcdkig/40687030883.pdfIn PDF document text
    • https://cdn.sqhk.co/fenozidu/gij3Aii/3765655871.pdfIn PDF document text
    • https://lefusavuforuv.weebly.com/uploads/1/3/4/4/134490278/kotitukufuxugodep.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/ije1gji/star_wars_roleplaying_game_starships_of_the_galaxy.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/8026830.pdfIn PDF document text
    • https://cdn.sqhk.co/fegukajebaj/doMjfid/wisulijebijudopuvoke.pdfIn PDF document text
    • https://javagakikidubat.weebly.com/uploads/1/3/0/9/130969576/09db8aeff.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/gagidjd/22431666076.pdfIn PDF document text
    • https://cdn.sqhk.co/miloxuso/djaiOFX/vigisozuxitawefivet.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/posufij/hotstar_mod_apk_file.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/adblock_pro_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/problem_solving_cognitive_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/icomania_answers_brand.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/php_ajax_email_contact_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gumegulaxi/adobe_audition_free_for_windows_10.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000d060.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD060 12148 bytes
SHA-256: f0b05b9d977efdf1228076ee148b86cfda0130049c2bbd5c04d37db7f9ef9cc6
font_00_sfnt_off0000bf8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF8B 4996 bytes
SHA-256: 107b205dfec2db1903a1fd1eaac336cce7ef0b861671b1e57a75abbf0ef5e22b
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 9760 bytes
SHA-256: cbe6371d87331eb844423afc9032e3413bee1dec638c9fb89c74d0ba18fff605

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