Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9ee9648dd81e2d…

MALICIOUS

PDF

73.4 KB Created: 2021-01-09 10:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4acb160dff8e5c16de07f7523e062b32 SHA-1: c754f955c329afd3bbcfee2dabbd61716c0143e1 SHA-256: fe9ee9648dd81e2db0bf632775377157a5d6db674eb1e476d12ee3a27a6ed69e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://traffine.ru/123?utm_term=thompson+algorithm+online PDF link annotation
    • https://gaditefu.weebly.com/uploads/1/3/2/7/132712385/bivuka.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/756fe76baa5a9a0.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/wilavo_semovaxurini_gofabetefefusaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471249/normal_5fb28fb32c18f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379377/normal_5f8d6cfe99809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499942/normal_5fbf1d8edf6c2.pdfIn PDF document text
    • https://nukoxola.weebly.com/uploads/1/3/1/3/131380146/fulituzobal.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450041/normal_5ff02659e256e.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/hehfFhf/sbk16_official_mobile_game_apk_obb.pdfIn PDF document text
    • https://leliwigozamik.weebly.com/uploads/1/3/0/7/130738568/futokutogedujim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454544/normal_5fdc5a21931bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388041/normal_5fb7ae32c637e.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/wajibile/psd2_incident_reporting_template.pdfIn PDF document text
    • https://s3.amazonaws.com/lososimap/bdo_mobile_english_guide.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_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 5184 bytes
SHA-256: ae79bfdea72022257aac9c1334ae8ce4919eea732abb2147be792c80e315227e
font_01_sfnt_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 11628 bytes
SHA-256: 0ddc394d5def7b9b9a6184c2ebdf5139ae0c91ac8ee7f338baedf8f751b7d137
font_02_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 16244 bytes
SHA-256: 37bd064822a4139c5d8e3cdb2e2dd8d0ae9d956962f76839c9edaf1267f3d3f3

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