Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd3271438cafceb…

MALICIOUS

PDF

96.9 KB Created: 2020-12-25 01:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 752783a0a6dec83565bdca3563e52515 SHA-1: 78b859edffe67672f75435c020b643e7cb342611 SHA-256: ebd3271438cafceb9364339e56d1364d5ff9b501e308bb654dc8a9fd9af91280
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to various PDF files, some of which are hosted on Weebly and other similar platforms, suggesting an attempt to obscure the true destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://trafftec.ru/123?utm_term=m%2526m+2020+milwaukee PDF link annotation
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/8f09e977ef9c26.pdfIn PDF document text
    • https://luwujapi.weebly.com/uploads/1/3/4/7/134751522/bimexa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f886eff28825.pdfIn PDF document text
    • https://dumunevebule.weebly.com/uploads/1/3/0/8/130874169/5092195.pdfIn PDF document text
    • https://bafixexewav.weebly.com/uploads/1/3/4/3/134352321/likizamigabup_wodumibezufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f89c3fd69b8b.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/cgcbhb8/tech_news_top_application.pdfIn PDF document text
    • https://ligavovifoma.weebly.com/uploads/1/3/4/5/134522072/fiwuremi.pdfIn PDF document text
    • https://porelananov.weebly.com/uploads/1/3/0/7/130775759/df0a3bffebe0.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/kuboki/7438263517.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 7688 bytes
SHA-256: cb5ae3807e46cbecabb321a9fc29de52d79f0aae499522220716bfae76144afe
font_01_sfnt_off0000eca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA3 2960 bytes
SHA-256: ba9dd86ad06677ef82b9fc66565cbe1db364e5caa8fb73f24ce3e10b7ab9a08b
font_02_sfnt_off0000f726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF726 4160 bytes
SHA-256: 2a2c5d160254fa5ea4185bc24710116cdcac5c3606b8488dc4b5558da7338d4e
font_03_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 6228 bytes
SHA-256: 303dcac89c17d00e936955988a223118c607d7679619d15860cdc2e7b41ec9aa
font_04_sfnt_off0001143c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 1804 bytes
SHA-256: da3441427d3e75bff49a51291186131708dca485fc2d1e7cdbc70da4c5455dde
font_05_sfnt_off00011d1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1E 15648 bytes
SHA-256: 899d11fe5d2bd2d0e43d423d76ab8ce8cc8b28066ba9410b45562ee0ac235f5b
font_06_sfnt_off00014d0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D0D 16604 bytes
SHA-256: c8363eb5db389a791e0e489963f56043d7c7cfcc61c1251e37ebfa4d7154c377
font_07_sfnt_off0001640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640C 6184 bytes
SHA-256: 7d27f049ed16b743542f80cef2935f075349f690b7dd9161d3c43570bc88f734