Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb68b4f96634fd1f…

MALICIOUS

PDF

82.4 KB Created: 2021-03-17 22:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 87dfc2d20d385462afccb5894c90e06e SHA-1: bcc8c703614a64d5feabe4e0a1a339d84ae7abfc SHA-256: fb68b4f96634fd1f6811b9239ca2526259f22964279cb097f7a48bd5833abb1e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and link farm heuristics point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/aws?utm_term=does+12+step+program+work PDF link annotation
    • https://cdn.sqhk.co/mawetadu/iggigOc/drawing_bar_charts_worksheet_ks3.pdfIn PDF document text
    • https://cdn.sqhk.co/doporaba/hcmidBv/best_dual_monitor_desktop_backgrounds.pdfIn PDF document text
    • https://bulasenojagaroj.weebly.com/uploads/1/3/4/3/134357248/genimifik.pdfIn PDF document text
    • https://cdn.sqhk.co/fixuzigetir/cjd3yhd/31411095282.pdfIn PDF document text
    • https://cdn.sqhk.co/wivenute/fhigdm2/beatevo_yg_treasure.pdfIn PDF document text
    • https://cdn.sqhk.co/dudavizi/cQjgouM/22761714728.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/diehijb/wepizenezi.pdfIn PDF document text
    • https://lenapejasuma.weebly.com/uploads/1/3/4/7/134749539/8694897.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/aEH0ghO/68803655578.pdfIn PDF document text
    • https://sefujokugitexas.weebly.com/uploads/1/3/1/4/131408298/bijoxewiwomasuzivox.pdfIn PDF document text
    • https://cdn.sqhk.co/zogameva/wooifC1/evil_within_movie_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/vemosoveveb/hdrjiqT/bavekakazuwalevom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/what_is_database_management_system_definition.pdfIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_8b09610c6e4b46c992986bc6bb5a87d6.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_fcca2c7ec496479d9e017b9a241b5f74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/farowug/fojinolodilewu.pdfIn PDF document text
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_86df3afa43414f91ac9e4894ceea9082.pdf?index=trueIn PDF document text
    • https://7835c217-6b95-46a1-915a-76cdebae3fe0.filesusr.com/ugd/debfb4_780549d486614e2882849218de6dc63b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/performance_appraisal_format_for_sales_employees.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/assertive_communication_worksheets_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/jemaxetasikonowobaralaze.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 5448 bytes
SHA-256: 42c0a5ab5049e34f085c5a6e8fbf7f455efaddafb2571bfe180c264ba37a1181
font_01_sfnt_off00011725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11725 11052 bytes
SHA-256: d4711627e18344040f129bcdfb989118568bc2183118b1f9b74b2214a60dee48