Malicious PDF — malware analysis report

Static analysis result for SHA-256 643fc8e65f7a7929…

MALICIOUS

PDF

85.0 KB Created: 2021-03-14 12:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b9e3bb782ff9ed470f1174eda74faa11 SHA-1: 1d686045e6391c8be2db3a6f6492edbbdd8df7f0 SHA-256: 643fc8e65f7a7929f5f1d04f91915667ee430cda88f40924aa189c7d84e63a14
222 Risk Score
Tags
free-cdn-ebook-manual-lure

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, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=budismo+para+leigos+pdf+download In PDF document text
    • https://cdn.sqhk.co/nejibija/ihaMVkK/dekibowonekibomipazag.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/d5hddip/college_football_players_40_yard_dash_times.pdfIn PDF document text
    • https://cdn.sqhk.co/fozuwasixeja/x1jh057/applock_applock_open.pdfIn PDF document text
    • https://cdn.sqhk.co/muwunupudi/esINhju/paradise_island_bahamas_homes_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/lunosupi/idgj1gf/dugotu.pdfIn PDF document text
    • https://cdn.sqhk.co/zolewiko/asifXii/76477700313.pdfIn PDF document text
    • https://cdn.sqhk.co/wokupogogote/mvKgiha/game_dev_tycoon_para_hilesi_cheat_engine.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/iiicjFv/maboledasarubowixo.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/t7cggie/download_school_life_simulator_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/SibigiH/xefamizasifigokuwe.pdfIn PDF document text
    • https://cdn.sqhk.co/furikute/ChjSthc/sejawurufefujelatukox.pdfIn PDF document text
    • https://cdn.sqhk.co/bezizafosu/ijhjdGx/fruit_slash_throw_fruits_and_make_smoothies.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/geVzAje/zafuga.pdfIn PDF document text
    • https://cdn.sqhk.co/vofemolat/gjuidgj/wezovagukel.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/jaUjgZN/buxanonofelagosupaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_6c96355d405443aaa0ff3c3ab1167f88.pdf?index=trueIn PDF document text
    • https://51956041-da35-40aa-96c1-085c1f47c80d.filesusr.com/ugd/e6e573_7ce3ee8ba99b471db54f05156d08cfcc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1b2a4c-181b-4d16-a309-8e607fb438b8/along_for_the_ride_podcast.pdfIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_4386775aa2e542d9b6b7df153725fd2d.pdf?index=trueIn PDF document text
    • https://19004eff-8f5e-45b0-b15a-9fbdbd99e39d.filesusr.com/ugd/578ea4_0264ba55e41a469b9c999cf18208f9c8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c28d26bd-1eff-4549-8d57-b13192e3ac53/1684757295.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_off000106e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E5 5504 bytes
SHA-256: 2f98c7ed73a07cfe549b585f8cc63a6be60d9793c3aca17384d099a74c33a80d
font_01_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 14980 bytes
SHA-256: 910facacc31cb245f277be640750bb45fb365b2a08e87a2ff8fd16c9f8c0f9f6

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