Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f69b23b5d2025b1…

MALICIOUS

PDF

76.8 KB Created: 2021-02-21 17:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9bbf9e07c3931313e390440f7e8928f5 SHA-1: 5e27060c245751ca8ce82fb45d40b5b982f8359a SHA-256: 8f69b23b5d2025b15a8ad35ad1880cf4bb3098948db842850ed4bf88d0ca2847
186 Risk Score

Malware Insights

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

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 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://crophysi.ru/wix?keyword=best+choice+products+jeep+upgrade PDF link annotation
    • https://cdn.sqhk.co/votojuxosaf/ijbMvYc/dragons_of_atlantis_celestial_dragon.pdfIn PDF document text
    • http://winwites.space/91827962234l05c3.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/94d9a1.pdfIn PDF document text
    • https://cdn.sqhk.co/nejisakatok/c70VUie/supermarket_cash_3d_model.pdfIn PDF document text
    • https://fexaxotira.weebly.com/uploads/1/3/5/4/135401388/92463852d98f5.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/hhDXjjT/51805917972.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/iegff75/frases_tumblr_de_la_vida_en_ingles.pdfIn PDF document text
    • http://sallehub.xyz/89734817678ry3j0.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/289bfe73f929a6.pdfIn PDF document text
    • http://loxigedu.iblogger.org/title_page_mla_template.pdfIn PDF document text
    • https://dufelawukada.weebly.com/uploads/1/3/2/6/132682042/fowojafodan_tigabipiwunon_kezubamoni_vodaz.pdfIn PDF document text
    • http://podipotekoi.ru/what_is_canadas_national_sportb98ws.pdfIn PDF document text
    • http://winsbig.space/in_on_under_above_worksheetuaih5.pdfIn PDF document text
    • https://lasapiboxemifol.weebly.com/uploads/1/3/4/8/134865682/c7b884c1d9.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/gosijuzepebhdl1.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/nakevoja/xilidaxikixo.pdfIn PDF document text
    • http://sasinazubusun.epizy.com/atoms_worksheet_3_more_practice_problems_answers.pdfIn PDF document text
    • http://wisunomimat.epizy.com/ruzujun.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 5428 bytes
SHA-256: 4ddc44ecbd543ab7a3b56261a5be1f6185c4959e65c8a513859cb60436eeae07
font_01_sfnt_off0001010b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010B 10672 bytes
SHA-256: 91750adbd8e138b4d2f30a69c9e1ab279fc282394bcdc77219293248f15062a1

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