Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc185b972c027d5…

MALICIOUS

PDF

85.4 KB Created: 2021-03-05 13:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8f684e9e87640304e94f24e93428893d SHA-1: f4b9e2e48860165210a21c64c3f885d23f665320 SHA-256: 8cc185b972c027d5025a55ded7b5edf357b9dab279c55e93bc84fa09ac80ca43
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, which is characteristic of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://leonvi.ru/wix?keyword=lunenburg+high+school PDF link annotation
    • https://cdn.sqhk.co/guranotup/DAVudgg/reflex_testing_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/xolofiwano/f3idQf8/pivonitu.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/5573349.pdfIn PDF document text
    • https://febukorev.weebly.com/uploads/1/3/4/3/134325382/80de36.pdfIn PDF document text
    • https://cdn.sqhk.co/nodezaneripe/yja4jcW/69262227097.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/if9xjfp/warface_breakout_stat_tracker.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/2746894.pdfIn PDF document text
    • https://cdn.sqhk.co/xopigotax/aOjjsml/hello_stars_app_download.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/e9lPvLi/95955080346.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/8oWlbba/popedewuwetazuzax.pdfIn PDF document text
    • https://cdn.sqhk.co/leporolino/RWF2rgi/47729871253.pdfIn PDF document text
    • https://cdn.sqhk.co/tudosiki/XggjXic/deer_hunter_classic_cheats_iphone.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/pukaridimupo/kilohearts_phase_plant.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/ca_corporate_nol_carryback_form.pdfIn PDF document text
    • http://tusibav.epizy.com/94561709401.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2eced06b-d03a-4d09-86a1-2dbdf198c7cc/sojoditozobagilisirumak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a120288-4a10-42ad-85bd-5bf2e00b0255/15086369420.pdfIn PDF document text
    • http://fivamoxopel.epizy.com/formation_conducteur_de_bus_afpa.pdfIn PDF document text
    • http://wobemiko.epizy.com/what_to_wear_for_semi_formal_wedding.pdfIn PDF document text
    • http://xifupoxenopi.epizy.com/battlefield_1_game_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/hypertension_guidelines_in_pregnancy.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/airplane_vs_volcano_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ac59179-232b-4356-8a1a-d2aef133b977/rutedeburizevadojajuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b66ab7-a6f9-44c7-b4e7-9569ba4094e1/scag_mower_sales_near_me.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/better_apartment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/zunewidimem/goretumabaposukuguvabu.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_off00011322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11322 4932 bytes
SHA-256: a106ada3044d3fae6d5df7244964859c8c728a77548ab1d94c02db40180b9089
font_01_sfnt_off000123f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F1 10572 bytes
SHA-256: 5ce617a8c716ec05cc5076c31e1a87021e51341f809826897fc4e69e5706607b