Malicious PDF — malware analysis report

Static analysis result for SHA-256 64f67fa7b905cb32…

MALICIOUS

PDF

89.4 KB Created: 2021-03-29 22:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 13e8c99fa64e803534bd7ed456f34235 SHA-1: 25d5dd97221b669db61c3be85565657d70d537e5 SHA-256: 64f67fa7b905cb3280adec8cc1e990476fb07ea901e4d3d53ddffdc38d136742
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/123?utm_term=sample+appraisal+form+for+doctors PDF link annotation
    • http://kujamemapevubu.mypressonline.com/93193020468.pdfIn PDF document text
    • https://rajajedoweji.weebly.com/uploads/1/3/4/3/134310645/5f1004a5420.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/bodewikizib.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/1830802.pdfIn PDF document text
    • https://putujagojosid.weebly.com/uploads/1/3/0/7/130738675/geluwerepapu.pdfIn PDF document text
    • http://gapijet.scienceontheweb.net/79010203109.pdfIn PDF document text
    • http://winatesef.sportsontheweb.net/machine_learning_engineer_google.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/the_beatles_sheet_music.pdfIn PDF document text
    • http://pixizosusonaxij.sportsontheweb.net/ancient_egyptian_hieroglyphics_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/caa53a06-3d2f-4771-bc3e-db0179f350b3/54747662720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1cbc059-87ca-421a-8974-3cd8488bf877/dutif.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/panduan_belajar_bahasa_arab.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/datozejotugowofefas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cb6e5f3-246b-4732-a66d-3c540e771af6/32995312718.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0459b0a8-849f-430d-9fcc-07f605f1b97c/428529361.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49803fde-6370-4d6e-bcb3-601cac0ed317/what_reading_level_is_junie_b_jones_dumb_bunny.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/6559391622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daf8e477-c0cc-46f7-bce9-63b83c110de5/wage_labour_and_capital_karl_marx_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/rockstar_mp4_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea02ad5d-c210-43a6-8696-75b162c7658d/what_is_a_legal_language.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf3a889-55d1-4ed2-bfd2-87ad7234005d/what_is_exploratory_data_analysis.pdfIn PDF document text
    • http://vilepobafomunow.atwebpages.com/harry_potter_movies_list_in_order_1-8_in_hindi.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_off000120cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CC 5404 bytes
SHA-256: e72fe8f9463e5d524c6fae25bcae132dbca660e378ea96d12cd4fa9d01e094e6
font_01_sfnt_off00013311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13311 11052 bytes
SHA-256: 7adcf596a756d927decd5d2c96a639ca2634dc5aafb3960f7be447fcffacff0e