Malicious PDF — malware analysis report

Static analysis result for SHA-256 76707c157643f1a7…

MALICIOUS

PDF

71.9 KB Created: 2021-09-25 13:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd7ef3d3085de3eee659349ceee9f94b SHA-1: ca668b057a7402adbfd1bdcf10ee9fb12beb5bf7 SHA-256: 76707c157643f1a7601653b5b0b4dd1a93568dedc236d6f478e8fb1c2e79edef
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links to potentially disposable domains, suggesting a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and URI findings point towards an attempt to redirect users to malicious content, likely exploiting a PDF vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://rayanchem.com/d/files/xaludaxagimimezopeni.pdf In PDF document text
    • http://siciny.eu/userfiles/file/47449817378.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912055700.pdfIn PDF document text
    • https://coffotea.com/uploads/files/202109032155056405.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/wazezuwakuwutim.pdfIn PDF document text
    • https://csodamalom.hu/files/files/77329248918.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/pegisabimedusugexegof.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16147721904477---naseriru.pdfPDF link annotation
    • http://studiolegaletrotta.eu/userfiles/files/57016137393.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109070422427178.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/2144336016.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614af2a61f4a5---34135389050.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/60947674895.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/23578352110.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/pevovejavijozagifo.pdfIn PDF document text
    • http://inphuduong.vn/upload/files/91712673870.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909112329399120.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd8972bcc---sexelebarunirinuwuk.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wadadumuxukimiki.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/popowopunenum.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16136aab0f376c---nawegupefafurebabubogeve.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/76923069370.pdfIn PDF document text
    • http://rs-entp.com/upload/file/56508723263.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+11+redmi+note+9+pro+globalPDF 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_off0000b46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 10908 bytes
SHA-256: d53867d79ea087f2a1342562b205ed091c5d4d595116c3f9ab1efea0efbf2c84
font_01_sfnt_off0000cd3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3D 17444 bytes
SHA-256: f2be7c4d801ec6cc133654e1e3eadcf36a6dbf5ae17a0dce65189e3bff717d8e
font_02_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1