Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07591f78185e010…

MALICIOUS

PDF

99.9 KB Created: 2021-05-22 09:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a8daa6bc1a928f52addb6fd15c666734 SHA-1: 975a47c24776b932a240a6d02db8f8e887e966ef SHA-256: f07591f78185e010944d0d6e14bacbee7bc843357cd2cf636258f10db4f3c24e
126 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=how+to+use+l%2527oreal+excellence+hicolor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387421/normal_60394d5608337.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/470db8b08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422909/normal_602ce562c0dba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475389/normal_5fde3b482cec2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477379/normal_600d8ce1c7b87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369907/normal_5fc776f513095.pdfIn PDF document text
    • https://zomuguwiremadak.weebly.com/uploads/1/3/1/4/131406071/7989165.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/gifugesegufu_gilofafixelel.pdfIn PDF document text
    • https://vafebukuwu.weebly.com/uploads/1/3/1/1/131163563/5353854.pdfIn PDF document text
    • https://bilobunu.weebly.com/uploads/1/3/5/9/135969114/886197.pdfIn PDF document text
    • https://wesoxuzepa.weebly.com/uploads/1/3/4/3/134372623/9179835.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453888/normal_5fccf36ce6592.pdfIn PDF document text
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/93efd031b17.pdfIn PDF document text
    • https://juvidefe.weebly.com/uploads/1/3/4/3/134319267/rewovudizade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422918/normal_5feff48ed0908.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://uploads.strikinglycdn.com/files/3ec40a43-a749-441c-827f-87fc3d07f461/logax.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/gosomozuwawanijozadosujet.pdfIn PDF document text
    • https://s3.amazonaws.com/libeganot/abbyy_flexicapture_standalone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3f3960-3b4b-433e-b97a-9fa19c5dd537/python_list_to_string_with_commas_and_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/26071639784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ab413c5-ec9c-4799-8db9-7f7773cc0393/rifosolilil.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/how_to_winterize_hunter_src_plus_sprinkler_system.pdfIn PDF document text
    • https://s3.amazonaws.com/rumezo/best_price_for_nordictrack_commercial_1750_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840d9a8a-fe65-487a-b3ee-828e85d9c902/bijivebokalamajijame.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C15 4924 bytes
SHA-256: 05c724dc574065f1758450a82e6ebba6eda54848478c01859ce0091b7cb1d908
font_01_sfnt_off00014cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDC 11708 bytes
SHA-256: 621d5153bf9b9d6133ecbf87b36f29cb191003661a34e3ad6da1a852a49a2d6f
font_02_sfnt_off00017419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17419 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176