Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7558d40cd1cb89…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 12:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0b7b41b5c6dccf2dc52c369c5fc0b131 SHA-1: 882867d9a93e2986bc49e7575c0a72a809cc153b SHA-256: fd7558d40cd1cb89c9892f417392517e117957c77a022aee8c08627274d2df37
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, many of which are associated with link farms or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=pokemon+go+fest+free PDF link annotation
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613432c7839d0---10003032387.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/67b933a483bbc854c6dcacbd18a6fd54/potimabexoxotuminexudame.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/20796466332.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/rozigobumumimumasadetimom.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/57949492601.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/pufakurulumoguxutanof.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/14030805729.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/77984866221.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/10024309245.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/58838445345.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/moxavilas.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/48273687841.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/pekok.pdfIn PDF document text
    • http://budka39.ru/files/ledofufixarotelepajokiwi.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/zanilimitufe.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/92268371504.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/garawixiwulo.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/20126794416.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/jonozuzu.pdfIn PDF document text
    • http://simoncaulkin.com/images/fafujepasobaxasuxoxig.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/51304632723.pdfIn PDF document text
    • http://perevodvnegiloifond.ru/pict/file/37270834312.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_off0000e256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE256 18608 bytes
SHA-256: 63372fa8f2ac66ae785f494219fcca62b12bcfd914cf3ffe87d6e1c2af2da449
font_01_sfnt_off00011310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11310 10348 bytes
SHA-256: 487f005f662fcfc43802421b32a6f1372d095cf58bd9aa86b07c047933916f9d
font_02_sfnt_off00012a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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