Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6108c46b773dacd…

MALICIOUS

PDF

72.7 KB Created: 2021-03-18 13:45:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 04c79873165b3c88f93600ebb5ae15ca SHA-1: 52d8b4a647951354706a5fcd0596cf67da0ff7d0 SHA-256: a6108c46b773dacd904772f72edf611fd92d0f58a1152597117d322f18c95e4d
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=afrika+korps+painting+guide+tamiya PDF link annotation
    • http://zilakagu.22web.org/xuzutasigixixamovaju.pdfIn PDF document text
    • http://tolofat.22web.org/the_standard_hotel_restaurant_new_york.pdfIn PDF document text
    • https://cdn.sqhk.co/fuzomorikat/hcDhjjf/86082062107.pdfIn PDF document text
    • http://wajazenizur.mywebcommunity.org/2012_honda_pilot_owners_manual.pdfIn PDF document text
    • http://kemamibuke.mygamesonline.org/82499814246.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ghjhaQD/extreme_car_driving_simulator_mod_apk_for_pc.pdfIn PDF document text
    • http://wusator.mygamesonline.org/tango_albeniz_guitar.pdfIn PDF document text
    • http://xilenemivagola.mywebcommunity.org/19070775927.pdfIn PDF document text
    • http://muwosolop.22web.org/bunakepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7fdfac3f-6618-460e-acfa-2cfe1dd1de0e/bimerigusavulosimele.pdfIn PDF document text
    • http://zapusov.atwebpages.com/trials_of_apollo_book_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea021579-acff-4f4e-a2ec-508b626a1a77/983448524.pdfIn PDF document text
    • http://sobenikirija.rf.gd/conclusion_for_hotel_internship_report.pdfIn PDF document text
    • http://nolifixumo.rf.gd/95336050133.pdfIn PDF document text
    • http://tejizikadojuni.epizy.com/39802658691.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_b341ca794de54021a112e754841735cd.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_eff37dfd93144c08a1c99ca96561351f.pdf?index=trueIn PDF document text
    • http://baxodivol.rf.gd/johnson_and_johnson_sustainability_report.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_c2bce29ed6c24722b420f103a3710eff.pdf?index=trueIn PDF document text
    • http://fazomexaboru.rf.gd/advanced_custom_field_plugin.pdfIn PDF document text
    • http://fejukuvazov.rf.gd/truck_car_game_karna_hai.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32f4121f-4b7c-431b-b749-9d9b428a238f/weider_pro_4950_exercise_guide.pdfIn PDF document text
    • http://lofuwup.rf.gd/keremugemujajewebabed.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB59 5484 bytes
SHA-256: ef5492be6f13b2fbfcc085273293ba2a21cdee522a3152ddaf5f74c5e4e9d83f
font_01_sfnt_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 9960 bytes
SHA-256: d3ccdb76a2fb0c19c2d199ac4a238af8cfe28e0e6bbb58e746d28aceb338a2f3
font_02_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 16092 bytes
SHA-256: e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848

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