Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b23c7ca76a8ea05…

MALICIOUS

PDF

75.2 KB Created: 2021-01-30 15:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 99ba4139764459a56e212b39fae412ec SHA-1: 219cef7d7758807373bedaea83d73f6af31465fc SHA-256: 9b23c7ca76a8ea05e781c232ed87c6f05438be88152e5464893c76437e645f78
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one URL leads to known malicious infrastructure. The presence of urgency language further supports a phishing or social engineering attack pattern.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/aws?utm_term=collision+reporting+centre+scarborough+on In PDF document text
    • http://converstarget.ru/winulejajefelunadasosasanp7me1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417024/normal_5fd638a60cf78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443598/normal_5fffe94ec64ed.pdfIn PDF document text
    • http://afracheat1.xyz/inflatable_pong_table_walmarto0m2x.pdfIn PDF document text
    • https://cdn.sqhk.co/sofaxuleruri/dijjahj/7926652911.pdfIn PDF document text
    • http://help-copyrightservice.xyz/vajuwavatufejimi26mb2.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/play_free_texas_holdem_replay_pokerj1nf6.pdfIn PDF document text
    • http://dumanejixaw.66ghz.com/bafg_antrag_nrw.pdfIn PDF document text
    • https://cdn.sqhk.co/lokemoxire/5zrdgju/ice_cream_blackpink_outfits.pdfIn PDF document text
    • http://cheapestshop.xyz/26320929486vuwpr.pdfIn PDF document text
    • http://avtoshtorki.shop/defulubiruvolugmkhu5.pdfIn PDF document text
    • http://digitalmedialit.com/30496372808v79a0.pdfIn PDF document text
    • http://lamovingcompany.com/throne_rush_gems_hack_free35wt9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417834/normal_5fcd3c8a35074.pdfIn PDF document text
    • http://wgathering.org/wisigizaduzads3wln.pdfIn PDF document text
    • http://vovevowumusiki.iblogger.org/850749523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd172651650d.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://suwulinivez.rf.gd/free_adblock_for_firefox.pdfIn PDF document text
    • http://nuvitaros.epizy.com/built_in_grill_reviews_consumer_reports.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_off0000db96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB96 5240 bytes
SHA-256: f67b32abf1826de8b764e5ce399ac8394c1b263942ee58154dec10ef4ea40765
font_01_sfnt_off0000ed59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED59 10708 bytes
SHA-256: e78296942ce83e8b8eb1dc92d57069dd54c154f26b180cb26b4d13f4090875d3
font_02_sfnt_off000110f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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