Malicious PDF — malware analysis report

Static analysis result for SHA-256 76ad5450b9f3dda4…

MALICIOUS

PDF

72.4 KB Created: 2021-03-28 13:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 72aad486d5c70faa9758a0efe6e97c3a SHA-1: 3c4e960930cef3182ccbff5545c9f0064013d513 SHA-256: 76ad5450b9f3dda4b9598f4f7f0d6d4986688791dfeb2035c566572c49aff4fb
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a game guide, a common lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=earthbound+game+guide+pdf PDF link annotation
    • http://dkblogin-de.best/zutuja77e1b.pdfIn PDF document text
    • https://cdn.sqhk.co/rosojolude/h0yUjeu/jcpenney_portrait_studio_provo_utah.pdfIn PDF document text
    • http://merovew.xyz/black_friday_tv_deals_uk_43_inchixq4a.pdfIn PDF document text
    • https://cdn.sqhk.co/tozerutiwezu/hfjhwFU/milk_chocolate_chip_cookies_without_brown_sugar.pdfIn PDF document text
    • https://cdn.sqhk.co/nekuripafi/rjhjjg1/89086262762.pdfIn PDF document text
    • https://cdn.sqhk.co/bumogebiz/ggVxLha/stickman_destruction_4_mod_apk_revdl.pdfIn PDF document text
    • http://bogplaktnc.fun/software_developer_interview_questions_and_answersbmyy9.pdfIn PDF document text
    • http://tebifujokejub.22web.org/80989976144.pdfIn PDF document text
    • http://vuratedonu.iblogger.org/51927825071.pdfIn PDF document text
    • http://jipetabonitu.mywebcommunity.org/gotuzeragisisozozigas.pdfIn PDF document text
    • https://cdn.sqhk.co/pabukerofo/cdGhigj/how_common_is_ticker_tape_synesthesia.pdfIn PDF document text
    • http://azules.ru/84374868894kjcbv.pdfIn PDF document text
    • http://levotavo.scienceontheweb.net/butetenujasik.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/57290060653.pdfIn PDF document text
    • http://torchland.xyz/68208514128wcnri.pdfIn PDF document text
    • http://poguferuliwu.iblogger.org/3006246989.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_1c9ef4b13f53455ab606677b628ff553.pdf?index=trueIn PDF document text
    • http://gewofudi.rf.gd/home_alone_6_full_movie.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_69a9ea79c2f64df79c53b87ab833a1f3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0591e6f5-b8a0-498a-adb2-6ee95ea0e692/reducing_fractions_worksheet_answer_key.pdfIn PDF document text
    • http://jikokajogov.rf.gd/81877026638.pdfIn PDF document text
    • https://f621ecf8-e26c-4db3-9bdf-176eeceb312d.filesusr.com/ugd/b3755e_7f4b6d587ff045799f72d1a88c507c3a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8236e6-8c36-4ba5-926a-264b8a75650a/what_are_the_symbols_on_the_dashboard.pdfIn PDF document text
    • http://nosawakudik.myartsonline.com/41052602253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/accabf92-44d3-4e78-9093-39cf68836b44/kawobojetilamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf8ea37d-bf8f-4833-836c-8ebb598e0abb/daguga.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_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 5340 bytes
SHA-256: 2c7f4b781741ad3881a68f0662c13d6c350b23068c8dc8f8ee64a94048cdc889
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 10416 bytes
SHA-256: fd4aaa42570eb5e9ee89683beb922e0c5495ba5236e541e8b47a1061c73b1fbf