Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf419582854ff374…

MALICIOUS

PDF

76.6 KB Created: 2021-01-24 22:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 90dc2c635fb7185da07d7f1510a2b75b SHA-1: 442fa9e8c35356938d3af1792478374e198d1cd8 SHA-256: bf419582854ff3746d4ddc07269fefe6295756167bb6121d0f4abff576d6b512
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious document. It contains a large number of external links, many pointing to disposable domains or file-hosting services, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=age+of+war+3+game PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365628/normal_5fd61e630ef04.pdfIn PDF document text
    • https://cdn.sqhk.co/litametun/iii2jfk/gun_shoot_war_game_play_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414871/normal_5fce784a730c2.pdfIn PDF document text
    • https://cdn.sqhk.co/pajugeluj/hFbijMz/brick_ball_crusher_level_310.pdfIn PDF document text
    • http://cleanup-sale.site/gulotokisedizajirafeked8tntd.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/IxsbjfF/assistant_dental_school.pdfIn PDF document text
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/818143f8d77a.pdfIn PDF document text
    • http://zdorovie-vashe-vse.xyz/bumunebunoto39bhv.pdfIn PDF document text
    • https://lilalosemojuwo.weebly.com/uploads/1/3/0/8/130814601/f8e8f.pdfIn PDF document text
    • http://tvoeobrazovanie.fun/ates_ve_su_11_oyunu_oynaxm7fr.pdfIn PDF document text
    • https://cdn.sqhk.co/fadanade/ggmieig/ultimate_car_driving_simulator_hack_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480755/normal_5fc85a731850c.pdfIn PDF document text
    • https://rezopagukivuru.weebly.com/uploads/1/3/5/3/135307961/fuberidinujuv-wubatalo.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/DyogjE8/88521967532.pdfIn PDF document text
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/783136b89.pdfIn PDF document text
    • https://cdn.sqhk.co/giwegulatil/emjzid2/30588408405.pdfIn PDF document text
    • https://jegobagugixados.weebly.com/uploads/1/3/4/8/134858953/1551639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446045/normal_600062f6d7ae5.pdfIn PDF document text
    • https://cdn.sqhk.co/tazuxalana/eGgjChg/microsoft_office_day_planner_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_5fd19c5dce20f.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_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 5120 bytes
SHA-256: a75e652320a772d84eb32c246389d6c8a27b1cb5f46c3672cb0ad9a1bde5ef1b
font_01_sfnt_off0000fdd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD8 12036 bytes
SHA-256: d2f0bdfc91049883ea1d1a40efb0685174e5128bac6bda9a3e415360ca228575

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