Malicious PDF — malware analysis report

Static analysis result for SHA-256 88139e62a3249cb6…

MALICIOUS

PDF

80.6 KB Created: 2021-04-26 15:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b0c55af43bd49fe4a874c3631399e174 SHA-1: 701268eb6bb2ffa552cdad46a1bb466b0abc41fc SHA-256: 88139e62a3249cb62f9ff00286bbc8492aecf11026fec0df3ea8b7513efcb020
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the document's structure point towards an attempt to redirect users to malicious sites, likely for further payload delivery or credential harvesting.

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://lozipotod.ru/strik?utm_term=what+you+eat+is+your+business+radley+balko+summary PDF link annotation
    • http://myfoxing.online/kanadur9lqco.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/biblia_de_estudio_palabra_clave_en.pdfIn PDF document text
    • http://zapixexarepol.medianewsonline.com/carrion_crown_map_folio.pdfIn PDF document text
    • http://tvoyoproc.fun/how_many_days_notice_must_be_given_to_terminate_a_month-to-month_tenancy9118h.pdfIn PDF document text
    • http://pafowitowa.medianewsonline.com/62329313292.pdfIn PDF document text
    • http://naturagrush.space/60338905268g15fn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://liroporuki.myartsonline.com/medieval_2_total_war_lord_of_the_rings_mod_mac.pdfIn PDF document text
    • http://vujadexofon.atwebpages.com/berlin_map_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de97268f-24c7-4521-8394-cfa26a81e63a/cuantos_tipos_de_derechos_fundamentales_existen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b651de-7db9-46c8-a5d8-83fe78670cc5/15825174917.pdfIn PDF document text
    • https://ffb80149-315c-4936-8637-e87477b606fc.filesusr.com/ugd/e7410d_c5279d99183748719f299b939acbbdc5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b0b507-3e12-4eae-9ac2-5f5c6783900f/zobuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deaca436-70f8-4a9b-a139-8c803ffc6c22/que_es_la_educacin_especial_en_chile.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803af138-b76c-492d-ba45-090a008bd088/tipos_de_comunicacion_familiar.pdfIn PDF document text
    • https://dc383e6d-b7a3-4e67-a88a-227fa542b6c3.filesusr.com/ugd/72b0e7_24f7cfb0dbec46a6882d7f76544159c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e9681c7-caa0-4043-9b3b-35f39b282b1d/gukanubusitexabigineral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495dddfd-1c1e-4a7b-ba51-4e817834f93c/mechanical_engineering_objective_book_by_rk_jain_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3ba36b0-7788-4a4b-b63e-0ca51ddbad28/55194546927.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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 4032 bytes
SHA-256: 9440f71eefa4f59c7a71b16fb0b9f65724f2db68f71ee41650680a98f027c4b0
font_01_sfnt_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 5384 bytes
SHA-256: 02649548cf16b9ce6fdc5d7fb67ed0275e0ded1e695cd8f1efc6c3dd8f98f92b
font_02_sfnt_off00010a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A28 12232 bytes
SHA-256: efa1b72cdff532cae238f76409f4fac391a3e5ea3288683e9b2713bd3a2fd9a9