Malicious PDF — malware analysis report

Static analysis result for SHA-256 b656b39c1125bd1b…

MALICIOUS

PDF

81.7 KB Created: 2021-02-28 03:54:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 55bf203247768eefdda37b49d936a8f5 SHA-1: 5f0fbfc5a7608124de790b57cb0f2758afe244c3 SHA-256: b656b39c1125bd1bd82281e8df09620bb3c466a8cdb51b1ab069af4017629aae
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wix?keyword=texas+revolution+worksheet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5ffbb73709856.pdfIn PDF document text
    • http://zolidunepojew.iblogger.org/marketing_mix_articles.pdfIn PDF document text
    • https://cdn.sqhk.co/zelosoza/jggjigM/drought_proof_grass_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448116/normal_60083abeb3168.pdfIn PDF document text
    • https://cdn.sqhk.co/rovukupovumo/VgdEjjr/medieval_war_games_free_download_pc.pdfIn PDF document text
    • http://xuxufawa.22web.org/avid_pro_tools_12_free.pdfIn PDF document text
    • https://makesagesuli.weebly.com/uploads/1/3/0/7/130740055/21584.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485457/normal_5fc7ac1a8f62d.pdfIn PDF document text
    • https://cdn.sqhk.co/lewulula/pg1hhce/26306160771.pdfIn PDF document text
    • http://losamaresufalu.22web.org/97566534162.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://luwulifinuneti.epizy.com/tagelebopugadu.pdfIn PDF document text
    • http://zaniwemikadas.rf.gd/bandit_queen_full_movie_moviescounter.pdfIn PDF document text
    • http://webataj.epizy.com/cpi_intouch_smart_hub_manual.pdfIn PDF document text
    • http://fitimulosegi.epizy.com/88079919895.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 5244 bytes
SHA-256: 4bed92106521b1c3b94b0a6d8f0ba541faaeba00274d537c84d414c779afcf54
font_01_sfnt_off000108a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A2 10240 bytes
SHA-256: 8347b3a780ed7b445956f8dd66ae8cb8a6e1d1115a55dbb83c0a7287a9276e95
font_02_sfnt_off00012bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBA 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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