Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6304beff12fe3cf…

MALICIOUS

PDF

75.5 KB Created: 2021-03-11 11:46:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0ea1d2bd5631a1518ae82ca6da30686d SHA-1: 8515d262bd081d09d176d23f895d8af2a49cd1e9 SHA-256: b6304beff12fe3cfc1b65a22d248a151ce6626621660ac2f583291dfc8b4ca97
164 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF_SEO_LINK_FARM heuristic and the presence of numerous URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mezovuduw.ru/strik?utm_term=lord+i+need+u+by+chris+tomlin+download PDF link annotation
    • https://cdn.sqhk.co/kawonidoza/bQghge7/soccer_coaching_drills_for_beginners.pdfIn PDF document text
    • https://xewulatejema.weebly.com/uploads/1/3/5/3/135345986/4767050.pdfIn PDF document text
    • https://cdn.sqhk.co/vetumuba/baed0gd/38199830300.pdfIn PDF document text
    • https://dugizixenopiloj.weebly.com/uploads/1/3/4/4/134457585/zinirajikekize_nabixemi_ginozunakiduxeb_ditiz.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/565d92ea3d0c.pdfIn PDF document text
    • https://cdn.sqhk.co/kobadaxo/ja6NPhb/54126486265.pdfIn PDF document text
    • https://cdn.sqhk.co/divononawe/jCbADVS/93493637224.pdfIn PDF document text
    • https://cdn.sqhk.co/wularumijif/7UGhiOD/like_a_boss_movie_review.pdfIn PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/cccdc322f.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://s3.amazonaws.com/suxugipipolazog/massachusetts_driver_s_permit_test_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a8ed78-1386-45c4-adee-beb14b76ca7c/dapple_weenie_dogs_for_sale_in_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bf59f8-91c7-4bc3-b734-5d5dd5cebf20/manual_de_calidad_iso_9001_version_2015_ejemplo.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_205dfadac1eb415fa293464b5f660b2b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jigezilor/42034625597.pdfIn PDF document text
    • https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_9f3ce974fa1846ec94176d0518e0794d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/gukupomujixukimi.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/jomogudirawaxadizazi.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/keto_recipes_cookbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34ca0de6-cd8a-4f33-856d-205e78cff211/is_the_book_refugee_based_on_a_true_story.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/51902107234.pdfIn PDF document text
    • https://d0275d90-c5b4-4c72-b581-d0e2b62fc6dd.filesusr.com/ugd/ee54da_e47b90a73e244dd5acd58b8a6d1b32fb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mujesogi/15477523718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a929e08-23d3-48ce-81e3-ff9ab07fc4b8/juegos_del_hombre_araa_gratis_para_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/broadsoft_call_center_reporting.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_ceb4bdfd7a3c467495c804c097669cf8.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_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 5336 bytes
SHA-256: 5cac5c948e03e15055abadb1a4408e527ef097fe3b8cad8ea6374287d65f51f5
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 10992 bytes
SHA-256: 5615a50ce973d72dc65ee751ba77bd41f5f436eb1f407017679da78343a04043
font_02_sfnt_off0001124b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124B 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361