Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3b8df8d6dc38a9…

MALICIOUS

PDF

69.4 KB Created: 2021-04-04 16:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 57961c31b8e8dd35a7d06aba9f44ff7b SHA-1: edf884f632633be93bddddac8745a29dcdbdbd8f SHA-256: 1f3b8df8d6dc38a99b7dfe5469503711ff3298d65e438441d05d36ff1a9a7126
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable hosting and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=san+juanito+jalisco+mexico PDF link annotation
    • https://cdn.sqhk.co/raxasumo/he79igz/3226511034.pdfIn PDF document text
    • http://dusejetiwogodad.getenjoyment.net/bharata_rajyangam_articles_in_telugu_free_download.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/why_does_my_roomba_says_charging_error_1omenf.pdfIn PDF document text
    • http://magazok.top/is_the_game_of_thrones_book_finished6ct7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501774/normal_6062b89b9a3f7.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/8uocThc/checkers_draughts_game_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/ketiwuvogi/hdtih59/bamini_tamil_software_free_full_version.pdfIn PDF document text
    • http://xxlmature.site/gone_with_the_wind_book_age_ratingjxzxh.pdfIn PDF document text
    • http://xirapanagix.getenjoyment.net/wogetijorozemet.pdfIn PDF document text
    • https://cdn.sqhk.co/vetelojid/jaxijhi/minecraft_pe_seeds_jungle_island.pdfIn PDF document text
    • http://iuts.space/lesuluripelassuhi2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368466/normal_603782c5c52c6.pdfIn PDF document text
    • https://cdn.sqhk.co/filemowa/ggrhahf/nuromolokep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasifowon.atwebpages.com/complete_bakery_business_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8701959a-a776-42cc-8feb-8cca8b79460b/7.3_powerstroke_transmission_swap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25b945ab-2643-4819-b151-c83e09f532f8/best_sat_biology_prep_book_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6050a217-0b3b-4a45-b84e-edc343fc4897/tidofamejikozanizinexad.pdfIn PDF document text
    • http://weponigonimogo.myartsonline.com/nutrition_et_sant.pdfIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_faecd159977347559977705662a09cfd.pdf?index=trueIn PDF document text
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_f46904570cf84d4e91a5074f6c8ec390.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdffadf-d615-4e14-a934-0e072a01756a/birds_and_the_bees_lyrics_idk.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_off0000d1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 5096 bytes
SHA-256: afa2134ad4cb6485310c153adf0c717976c0a93f1146a2b82879bf5828fbc759
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 11412 bytes
SHA-256: 76bc527ce269794e5bb117917d179aee9ac75b164d89f6aeeb7d68738d631a87