Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea1a1463fce3429…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 16:31:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 589fdac1945331fd7b03a0beafd5e432 SHA-1: 5ac525400250b9c634cffcc33bca29211d7597f7 SHA-256: 4ea1a1463fce34291a4436ddcd8028da5667d94b3af56d82101404e0b0fb941e
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 0.9991

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://gimoguvi.ru/strik?utm_term=unication+g5+pager+for+sale PDF link annotation
    • http://redirunna.xyz/bepiputarn73u.pdfIn PDF document text
    • http://maroron.22web.org/lerulewe.pdfIn PDF document text
    • http://marojuburegorad.22web.org/god_in_the_dock_movie_summary.pdfIn PDF document text
    • http://cetapp.xyz/pefitikanuzugotogajodlrjvd.pdfIn PDF document text
    • http://formverifiedbadge.com/promodj_top_100_djibg2h.pdfIn PDF document text
    • http://varietystore.website/study_guide_for_cpc_examlyck2.pdfIn PDF document text
    • http://meetplafond.xyz/ditajisiw7l19b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_95918f307ebb4894865ec7712e315764.pdf?index=trueIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_868a5eb8bd6b4c82978c6bb02cca24d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/82ab1e24-e796-49b4-8471-df2feb811158/24711521847.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_b1826524c31f4763b738d5c5dc2afef0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3694c1-5581-4c0f-806d-d091d7cd2df5/dutojazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6071d5d7-2519-4fd3-8570-f7ccbc82a38b/34884460523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afa18daa-dd36-410a-b638-de2d68a84b95/tasirofo.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/32377513711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/619b048b-5b07-49b2-8ce0-d356335bc2c9/pajebonibutan.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/can_t_find_platform-_tools_folder.pdfIn PDF document text
    • https://s3.amazonaws.com/lolijexejomak/25881511144.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb76a01-f8a7-46b7-9523-da79a96f2c9d/online_model_booking_team_manchester.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/kobenexivilipad.pdfIn PDF document text
    • https://023e3b0e-89aa-4e00-bd19-175c11a0a9c0.filesusr.com/ugd/5f4883_c1aecc5df7e14472abeefc6847a00aae.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdb2457f-f281-4ed3-99aa-0dbddede1453/wolf_handbook.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/dark_souls_remastered_walkthrough_depths.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_a6f57a49f74b4d5785f00998d6bee09d.pdf?index=trueIn 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_off0000f6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B9 5296 bytes
SHA-256: b798c67ab768a45d79596f9103fdde44d938f5bc4613bae410eebb060a3585cb
font_01_sfnt_off000108d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D6 11324 bytes
SHA-256: 7cb42806d3f836a38c89788cbe1452ee334b0334e1503b8ad905fa95d721d02b