Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a8d65fa6d5ab63…

MALICIOUS

PDF

88.4 KB Created: 2021-03-14 18:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 404633e84ecf1c2703c9df9a5346887a SHA-1: 30c8f93f96204de3925a7f8677e1087fa6681496 SHA-256: c3a8d65fa6d5ab63f41e5a76c6f4db2e1cf6cbe1cf76ebf3039c5f3b9db84464
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 0.9951

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://dafemum.ru/award?keyword=shortage+occupation+list+uk+pdf PDF link annotation
    • https://xakebugus.weebly.com/uploads/1/3/4/0/134018628/9452852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454547/normal_6047091135d18.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/clviFdh/3d_printed_house_builders.pdfIn PDF document text
    • https://ruwitopiramowu.weebly.com/uploads/1/3/4/3/134364975/vuxupidixamawef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388037/normal_602553e9a8e15.pdfIn PDF document text
    • https://cdn.sqhk.co/kejaxedusuk/Vidiigc/685056008.pdfIn PDF document text
    • https://cdn.sqhk.co/mudinaxape/NMfqThi/jasazilinejodipujimo.pdfIn PDF document text
    • https://cdn.sqhk.co/dodiniwotud/ifaQidy/spin_the_bottle_game_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448743/normal_5fe26d2db2669.pdfIn PDF document text
    • https://xavimunemu.weebly.com/uploads/1/3/2/8/132815343/tamiko_jusejidetanera_fesuzag_golemisok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479902/normal_5fe80dbf34f1d.pdfIn PDF document text
    • https://sadewurepoko.weebly.com/uploads/1/3/0/7/130776460/godatev-leruxebi.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/c9e73cd9-b2a2-49c3-afd3-438de26d9d2a/30952383550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7df88126-4203-4330-99cc-4af3bf38b59e/rixusafil.pdfIn PDF document text
    • https://2a497570-3881-454f-aefc-229a18bbdf22.filesusr.com/ugd/83e24f_3951645119124eb9a60f5a700c3e5c4c.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_03cf55a5790c449dbadda5cc81925a79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a199234-4450-4657-86ac-ea3636563525/56367505097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b410501-72dc-4b10-9e18-90bf9fa27f8c/metal_gear_solid_5_the_phantom_pain_ps3_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/928aab3f-8da2-4cbd-af39-5ecfc2bc7334/how_to_get_an_ep_eval_navy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358e00c2-2493-4ae9-9e88-ecacd1b7b936/wigufik.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_d725537c9b904dacab1bcdc633b66ef8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb80dbfc-5848-460e-8871-48692648fa59/dictionary_english_to_hindi_download_for_pc_windows_8.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_3fd5ca4252f540349bc6f66041207eb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/019af45e-45be-481e-9d75-595b65f8456c/tizuvusudaxebobolejejawef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e39c9bba-0ffe-445d-b8c9-242945e76768/attack_on_titan_season_4_full_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5116470c-2c95-443a-aab6-43c4835bd0bb/84168017729.pdfIn PDF document text
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_78fde65ff985485db95c97447abe9328.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E11 5468 bytes
SHA-256: 17c1e5ec2fa8e21531010c97508dcc691561e1ae6d1ef684a470bbfb1f1fa6b3
font_01_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 10892 bytes
SHA-256: e9c27c03f159236c380731a371c3469bd383efa611137e571779a333570139d8
font_02_sfnt_off000145a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378