Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc05e245db6addeb…

MALICIOUS

PDF

87.2 KB Created: 2021-02-15 20:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cb54faf92de669adc1e85c4787e80837 SHA-1: 3eff244cabc47215866040bdc20d5d741e9a04ac SHA-256: fc05e245db6addebe57b4b4fb2ec81f57e2757caed694548c0b724de158021cf
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to other PDF documents. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the link farm suggests an attempt to direct users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://baarspo.ru/wix?keyword=a+concise+introduction+to+logic+exercise+1.3+answers PDF link annotation
    • http://ductsunlimitedins.com/61298074344i8hbq.pdfIn PDF document text
    • http://albatros-trans.ru/que_es_el_contexto_linguisticoejtxb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469631/normal_5fe051966a7b9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455660/normal_5ffe1a8eeb6ad.pdfIn PDF document text
    • http://goproonly.com/2007_chrysler_aspen_navigation_manualqco14.pdfIn PDF document text
    • http://scoretdho.best/howard_anton_linear_algebra_9th_editiontt0cn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413122/normal_5feeaffbc0b8c.pdfIn PDF document text
    • https://fudosabitewixo.weebly.com/uploads/1/3/1/6/131636852/2654862.pdfIn PDF document text
    • https://berarenojinoz.weebly.com/uploads/1/3/4/7/134737003/fijegekagufuvawu.pdfIn PDF document text
    • https://jezipupokegem.weebly.com/uploads/1/3/4/0/134042816/fesumurenegejakoloro.pdfIn PDF document text
    • https://lodonukatozusa.weebly.com/uploads/1/3/1/0/131070116/wasisas-piwadudoje-xexinajawefupa.pdfIn PDF document text
    • https://pamenusunawot.weebly.com/uploads/1/3/4/0/134041165/mimim_tawot.pdfIn PDF document text
    • http://libralab.digital/57384918358v3vrr.pdfIn PDF document text
    • https://nedetuvozuwe.weebly.com/uploads/1/3/4/6/134699612/52fe018c1901.pdfIn PDF document text
    • http://fragcups.com/sample_project_management_closeout_reportqbmln.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001196e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196E 5504 bytes
SHA-256: c19704d70ea04d779c525d12cadb48b9c777b34582ec28e2d6b46e43a5211b7d
font_01_sfnt_off00012c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C50 10172 bytes
SHA-256: 0a46a295377d774327bd7038a8e2b3f75c7e2625fc4f9bc82aaff1bbe7d20bf4

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