Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d2357867a86cb8…

MALICIOUS

PDF

74.7 KB Created: 2021-05-19 08:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 0eac8f985eaf46a96e38bae2e76fbd08 SHA-1: c79b25cb4609f1fafd305ef349ff1b45ad6b6988 SHA-256: a1d2357867a86cb81238dc031b31fc186d0a2f0f1d5dd878ebb2ff6d405b1720
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains heuristics indicating it is a phishing lure designed to trick users into installing a browser extension or update. It also contains a link farm and an SEO redirector, suggesting an attempt to distribute malicious content or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://bologen.ru/strik?utm_term=can+i+sue+netspend PDF link annotation
    • https://kozutimisomu.weebly.com/uploads/1/3/5/9/135982974/gexedonegog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_5fe31171da738.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403131/normal_5ffab62586ed5.pdfIn PDF document text
    • https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/9127676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402964/normal_6030778649d8b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426830/normal_602ec434eba37.pdfIn PDF document text
    • https://lebuwaner.weebly.com/uploads/1/3/4/4/134478239/5931290.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484364/normal_6003450787fc0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/microsoft_powerpoint_floor_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/34362268797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc23f5a-c5f4-4419-be31-466bb476b41e/how_to_program_a_radio_shack_scanner_pro_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/22120844034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8a47d60-3214-4cfc-92de-fa6e50f6879f/wedivevujisimi.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/nixon_the_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b409cb8f-bc9f-4f3e-935b-41b49c913717/3889702748.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ae003cf-aaa2-47d3-9269-4e9ccca37d87/champion_7500-watt_dual_fuel_generator_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/8740099121.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/greek_olympics_ks2_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9234cea0-5e75-4d08-8fd7-335cb8c90d67/remupofure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfb6d82-04ef-488a-a766-7b6bf00e1dd9/sas_ods_csv_z_os.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a22e3b0-0426-4724-8c1d-a4a2cdd23a58/sabuxunuxatizetojutamas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4372f91-8e72-49ce-a0fb-26d593a55811/62546220558.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/xakozo.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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 4728 bytes
SHA-256: b4171e1b03967c878b96b5e677654641f0018a80b3335199a09f615e4b6761f4
font_01_sfnt_off0000f6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D8 11512 bytes
SHA-256: 64a87d52a4efd75c851270ee40d7e9f7431314dc7ca0d1a98a1932ee1b6b242e