Malicious PDF — malware analysis report

Static analysis result for SHA-256 a103c0cf699ba6e0…

MALICIOUS

PDF

78.5 KB Created: 2021-03-18 02:26:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a44045f7ada817483b325aa9dae53838 SHA-1: 3b294709e6d21a3598039a4e95a0f77bd17ea263 SHA-256: a103c0cf699ba6e03c59240d776410bb66b32ba7f2356a2732766b0f01c95991
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://mezovuduw.ru/strik?utm_term=kriya+yoga+meditation+music PDF link annotation
    • https://kovelikazaw.weebly.com/uploads/1/3/4/7/134705675/f85dd4e2.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/47507086641.pdfIn PDF document text
    • https://kobizixudowizeb.weebly.com/uploads/1/3/4/4/134402546/1485507.pdfIn PDF document text
    • https://zomereke.weebly.com/uploads/1/3/5/3/135397468/fotef.pdfIn PDF document text
    • https://sekorora.weebly.com/uploads/1/3/4/8/134856449/9480324.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/puzad.pdfIn PDF document text
    • http://norikaloro.mywebcommunity.org/how_to_replace_the_heating_element_in_a_masterbuilt_smoker.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/motovusup-juxizelipexinim-numudanu.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/a4a2a07e-9f60-47f9-bd70-0f1bbd615029/war_of_the_worlds_cast_1953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f155f503-8129-4419-9065-0a57604fa518/10401860694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b24d7c2-2f47-401a-a44b-fc89c3ef7d8f/mejasezolu.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/turefozevulipa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b5925d-79e2-4793-b7eb-c71230715da3/55036518488.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/this_is_amazing_grace_phil_wickham_ft_lecrae_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/image_asset_studio.pdfIn PDF document text
    • http://famomijis.onlinewebshop.net/anti_corruption_law.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27b57e62-d0f2-459c-ab2c-8f7bc7c3aa28/puvibajilugalekeku.pdfIn PDF document text
    • https://s3.amazonaws.com/kisimujuk/37281257228.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e0d6808-cb79-4203-a91b-97357e216e2e/rheem_tankless_water_heater_error_code_c4_13.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98b95251-41ae-4ecb-b2d2-9f7a867aa7f8/how_to_harvest_and_store_romaine_lettuce.pdfIn PDF document text
    • https://s3.amazonaws.com/fejififimaketo/panebedodonuzatudajibido.pdfIn PDF document text
    • http://luzojora.atwebpages.com/cephalosporins_generations.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_off0000f771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF771 5300 bytes
SHA-256: 641c3e23332e0102bee9eca29e6b3dd8a6f2b106ba55954770bd726f8d2099a8
font_01_sfnt_off00010973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10973 10420 bytes
SHA-256: 46ba8a5901fb26f2fc1054d0fff6cd66bcb4f822f60c3757490a1a9ccf4e62bd