Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71207f9aaf6cd50…

MALICIOUS

PDF

83.8 KB Created: 2021-06-02 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 16bb0dacaa8a628b2f23e386e129ff5c SHA-1: acf74d3e9b71402424ad9675ba8cd294b5d11e58 SHA-256: b71207f9aaf6cd50098954a091509fbb22827ac1153ed49960979c5335184424
186 Risk Score

Malware Insights

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

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 a link farm or phishing operation. The embedded URLs likely serve as lures to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

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://baarspo.ru/123?utm_term=castelli+jacket+size+guide PDF link annotation
    • https://lubumona.weebly.com/uploads/1/3/4/6/134648672/rimaxigokusad-gegetarakiki-tubowaduwebaf.pdfIn PDF document text
    • https://moremutinujiti.weebly.com/uploads/1/3/4/8/134865562/tugediwutag-podamibe.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/ab2c0387-57b3-4f78-b7a7-2f4dcc24597b/subjunctive_mood_exercises_advanced.pdfIn PDF document text
    • http://supatibu.pbworks.com/w/file/fetch/144418443/lasakaterotumikalujo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fadc489f-d32e-43da-8898-a50512185b98/jajuzajitisonavutajumu.pdfIn PDF document text
    • http://kevuxezedila.pbworks.com/w/file/fetch/144445668/98505024075.pdfIn PDF document text
    • http://detomipipu.pbworks.com/w/file/fetch/144518079/dashing_cm_bharat_movie_download_in_hindi_720p.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144432426/52135393375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4d9bed-5a52-4017-b691-499d1e80a70a/fazenumopukaxovodiduwezis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/05fd29f1-5912-4e9e-93f7-b04f2d52fbc2/kejumemudepulogi.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/f/tafamive.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/dedipavir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d07c8897-e4e1-4dc0-9584-14403cbd85ca/748146062.pdfIn PDF document text
    • http://didaneguk.pbworks.com/w/file/fetch/144425217/power_probe_3_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/140e7a50-0a2b-44d5-bcb3-ac05d154cf6b/pokemon_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68bf7b0c-13c4-44ac-ae61-88e59b72c891/introduction_to_analysis_gaughan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9198ed0-ab4f-45f2-9310-93e4c951c076/the_torah_is_composed_of_how_many_books.pdfIn PDF document text
    • http://siruzosu.pbworks.com/f/63900841784.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 5108 bytes
SHA-256: fbaa88fbd15e6c9277d6d464da80c37cca06481704717ffdd5309f2476940ac1
font_01_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 13488 bytes
SHA-256: bb6a3c4a4a68168c883de2a3ffe0ba64b716b338cd1d7f24168d38f72d3b29b6
font_02_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16284 bytes
SHA-256: 9e72eb71cec9de0c778457f6415ace9b059829408473d8201bd10fc7b1fb75ca