Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c2713036ce8120…

MALICIOUS

PDF

85.0 KB Created: 2021-03-28 20:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6225fccf37a7fa270c2be8e1dd32ec11 SHA-1: 265c2dc83d8ca9d90de587d79339e695190be6ca SHA-256: 98c2713036ce8120463da53eebd09b73943247b376544f3d7fda7c85f4d4c86a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=what+are+examples+of+biotic+and+abiotic+factors+that+affect+population+size PDF link annotation
    • https://cdn.sqhk.co/nuvurero/xgihfjc/flux_flow_free_sci-_fi_puzzle_game.pdfIn PDF document text
    • https://bobugebajagon.weebly.com/uploads/1/3/4/6/134682349/ed0fea051cec764.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/gcohbpe/55347386998.pdfIn PDF document text
    • https://gepogujewo.weebly.com/uploads/1/3/1/3/131382217/tategovo.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/v7Vjahg/neo_scavenger_starting_guide.pdfIn PDF document text
    • https://malotote.weebly.com/uploads/1/3/4/8/134872882/3762578.pdfIn PDF document text
    • https://ganubidorebe.weebly.com/uploads/1/3/2/7/132740923/dipowolinebakaxagaf.pdfIn PDF document text
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/kopisobekate-buriwarukezus.pdfIn PDF document text
    • https://cdn.sqhk.co/nalujujoso/jha4KU2/how_to_draw_evie_from_descendants_realistic.pdfIn PDF document text
    • https://tuwunujanopir.weebly.com/uploads/1/3/4/6/134617400/madufulov.pdfIn PDF document text
    • https://cdn.sqhk.co/jebuxanit/gjghjcW/how_to_get_lv_filter_instagram_story.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/gjghRNQ/car_driving_games_free_download_for_windows_xp.pdfIn PDF document text
    • https://cdn.sqhk.co/berazanoga/bdGjhii/barimosamusawowugukulav.pdfIn PDF document text
    • https://menanolunum.weebly.com/uploads/1/3/4/7/134754058/3522574.pdfIn PDF document text
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/wujomunonida-fovuzofoked-fifinoze.pdfIn PDF document text
    • https://dogeremezirezar.weebly.com/uploads/1/3/1/3/131379343/wubomemomilemudu.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/jbhdIZ4/bedorixuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_c87960df71c44b088a383da0ef9f5b79.pdf?index=trueIn PDF document text
    • https://627ea4a7-3f28-4bf3-8c99-6a9da7dacf48.filesusr.com/ugd/1970e2_498a010973be4935a62baebdf5d22cf9.pdf?index=trueIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_8738965cdb164e979445d981df4cb201.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_off0001010f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1010F 5664 bytes
SHA-256: 713432d8262a7fef4215b6ea02e3aab3efd936b336ccadfe533764dc7b227906
font_01_sfnt_off00011432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11432 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 11228 bytes
SHA-256: c5d12888cdca57af70ed593608f92eb7d9ee7a727f6600637ad4e1dbb1e1f0e6