Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0d202926108dfb…

MALICIOUS

PDF

78.4 KB Created: 2021-03-27 10:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: fb771e372a0d33a188cdec523ff9ef2b SHA-1: e1e12c5f40c1ce1f13886d3e5f003243a3b9cea0 SHA-256: 7b0d202926108dfb51a072abb9fe9360c5512d3fb7930488d3c524dd9e97df39
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or hosting further malicious content. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://seumenha.ru/123?utm_term=verbo+scrivere+forma+passiva+tutti+i+modi PDF link annotation
    • http://tigafik.mygamesonline.org/wanomotivijinoxeb.pdfIn PDF document text
    • https://cdn.sqhk.co/dogutadova/ejajbf2/51610144021.pdfIn PDF document text
    • http://lijonotogi.scienceontheweb.net/gndu_bcom_syllabus.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/zetatiwawow.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/7985119.pdfIn PDF document text
    • https://zudoxinegez.weebly.com/uploads/1/3/4/1/134108693/nexoxodovajikamer.pdfIn PDF document text
    • https://nekazexupogufeg.weebly.com/uploads/1/3/1/4/131454238/xerem.pdfIn PDF document text
    • https://devitigofe.weebly.com/uploads/1/3/1/0/131070043/zobekop.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/hghb175/elite_killer_swat_mod_apk_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelemusib/gfjbuvL/37213760618.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f45a390-919b-40e1-8c73-8a65194fe6e1/20815309496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81d51e45-00ee-479f-ba9c-df6af50ed25b/42637118685.pdfIn PDF document text
    • https://a815f367-2516-4b88-9496-eed07d5c1eb7.filesusr.com/ugd/665c20_f55677e256fd4e3b93cdf81cb0683774.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fbbbd57-a27e-4cdd-99ec-98e1c04e69fa/24898462575.pdfIn PDF document text
    • https://5b3a2631-baab-4d1f-8161-183aa5bfd7a2.filesusr.com/ugd/5dc2b7_b85996e02f7c46a4869b3aba558d3457.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b005f21-79e4-413a-8b2b-34a228fa1ddf/70382868322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae4b366e-4ce0-4f87-8356-ffc7291bee82/54131308278.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e97ceb-cd08-4f42-9475-daef8b3ea837/2422390350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48db03aa-620d-45b9-b9af-83da4458460d/thermador_refrigerator_water_filter_location.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://scripts.sil.org/OFLIn 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5436 bytes
SHA-256: 3c74951ae5e1f9e8d33d12c9ef86564672afdf07760005084d5ad8b40989403b
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 12148 bytes
SHA-256: c180e0f10d0ddb91ec1992a33896b67462c8478a85feddcb98217924250bd6e7
font_02_sfnt_off00011559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11559 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2