Malicious PDF — malware analysis report

Static analysis result for SHA-256 1523acdd07fe0866…

MALICIOUS

PDF

109.4 KB Created: 2021-03-17 22:34:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 068e38339cfcb64428d0348434a05fbe SHA-1: 577f1c878dc2d4e753ed3eb69728a34594583b14 SHA-256: 1523acdd07fe0866d0cfac5fcb48e5697dad7cda6b1a3289c43dbbe5423295b1
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, including a suspicious one hosted on xezojetit.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://xezojetit.ru/award?keyword=wheelchair+basketball+drills+pdf PDF link annotation
    • https://databuzub.weebly.com/uploads/1/3/4/3/134373368/19b0630.pdfIn PDF document text
    • http://bumululoru.mywebcommunity.org/xugikozi.pdfIn PDF document text
    • http://fajamad.mypressonline.com/81903450905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368745/normal_601d90cc12558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405193/normal_5fd27c23c4171.pdfIn PDF document text
    • http://suwadebizon.mywebcommunity.org/what_do_you_mean_by_kinematics_and_kinetics.pdfIn PDF document text
    • https://mabamigetope.weebly.com/uploads/1/3/4/4/134493328/dilipifir.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/76902670902.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/memento_mori_ejemplos_poemas.pdfIn PDF document text
    • https://patosalar.weebly.com/uploads/1/3/1/3/131384166/padupub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_6012413a83e8f.pdfIn PDF document text
    • https://buxijoxusezo.weebly.com/uploads/1/3/1/4/131483018/rerenalatodaz-wofiwex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/00bcc8db-991b-4037-b09d-1a994acf7026/behringer_inuke_nu1000dsp_software.pdfIn PDF document text
    • http://pavabiza.atwebpages.com/nutri_ninja_pro_blender_good_guys.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb3504f3-ec09-421a-8b6a-a004798a6df0/sisujakepirumofufusok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9e59c91-bceb-4de8-9b27-555bc373bbf0/13153036821.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/94566635302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db6c769f-9a37-49a1-b2fe-47c93d50f566/66148301473.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c0769de-5480-4c49-bc54-055d1d60ec06/does_apple_still_support_ipod_touch_5th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61922920-3fa1-4c9a-9592-1446c6d17c0e/fumaronavutesodisidiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064a719f-ba85-4898-83dc-cb9b6118754c/zunevagizofezisikirubam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0a714c-e231-4102-b5ce-430f4295b11a/educational_psychology_textbook_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c1ff4f2-f51f-444c-b126-94fbcfcc56b5/rimas_y_leyendas_gustavo_adolfo_becquer_libro.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_off000161c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C0 5032 bytes
SHA-256: 90c402d7dc0329c6961a01275eaa1f82e8c8ee2d8f55c59f9c52fc0b5f3866f3
font_01_sfnt_off000172ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172EC 11224 bytes
SHA-256: 56674152f4078f90748aad59dc77bc0f1f07ed7784dd6f12b32e406a6b75c4cc
font_02_sfnt_off0001990c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1990C 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34