Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7714c28eff4043b…

MALICIOUS

PDF

71.1 KB Created: 2021-06-08 00:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f3fba6e00fbf63db335208c6fd195688 SHA-1: d2c0162a8b84673acf7ef1b4c4f2f099c9011e2a SHA-256: b7714c28eff4043b3002a8ae828a011e65f12c72283a7b2dbd6ad345a6ebf1eb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to drive traffic to potentially malicious sites. The primary external URL observed is https://nomylo.ru/pbw?utm_term=cosatto+bola+cot+instructions, which is likely used for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=cosatto+bola+cot+instructions PDF link annotation
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/5084280.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/zinibor_mikozane_xogezason.pdfIn PDF document text
    • https://naxibozagut.weebly.com/uploads/1/3/4/5/134580084/dedekaxavofokab.pdfIn PDF document text
    • https://waluxine.weebly.com/uploads/1/3/4/7/134759732/1d03c5477d1f01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144819501/how_does_jem_finch_show_courage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af47d0ca-6549-41a2-a9e3-83c58c434cc4/shooting_drills_football_u10.pdfIn PDF document text
    • http://buvavipoluvu.pbworks.com/w/file/fetch/144605517/darudedosilefavowitofivim.pdfIn PDF document text
    • http://zajozote.pbworks.com/f/el_arte_de_amar_publio_ovidio_nasn.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144418173/yds_publishing_deneme.pdfIn PDF document text
    • http://xuwajesorewo.pbworks.com/w/file/fetch/144642678/sejegodagezakumuzag.pdfIn PDF document text
    • http://disisopaz.pbworks.com/w/file/fetch/144819768/tomutosowadoxi.pdfIn PDF document text
    • http://buvevogixud.pbworks.com/f/96713291520.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f1d7adf-6bde-49ec-86dc-6a7ead857b9a/cuban_cigar_size_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0182a013-5eb7-4eb4-94ef-9e449b546a0f/12269401559.pdfIn PDF document text
    • http://milatufed.pbworks.com/f/samowulexiradekewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4bd6db-59fb-4457-b448-c885571a8c70/new_yorker_weekend_crossword_puzzle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39b92f3b-68bf-403a-954f-2ea6cb65e5d9/how_to_test_blue_yeti_mic_on_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ba0f608-3a12-4c3f-a480-cca2b4e57420/hp_deskjet_2545_not_printing_color.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/338a51e1-c807-4f5d-bc55-109ccb1e39ce/vikibosutesiwasinizijezub.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144553641/1998_bayliner_2452_ciera_classic.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_off0000d86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 4836 bytes
SHA-256: 4ac1c7063226a536c7b75ee6b3110a566baf420e22ed60180d9d1736d3fd607e
font_01_sfnt_off0000e8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E2 11164 bytes
SHA-256: a770f537797066468790824e1df192600843935a06bcf59164cbecc6d59f4511