Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d7c2ad7432e985…

MALICIOUS

PDF

110.4 KB Created: 2021-03-10 18:06:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 05faaf4a5d7ca1d596aff3a2b3b10329 SHA-1: 5c76aaa007a896458ed94e6a3cad9a2ae752187d SHA-256: f7d7c2ad7432e9857f1f16c5f4189094c2d7b9f99b13e7e1d42e7b4c5bbe1f06
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://resalured.ru/award?keyword=concise+biochemistry+mcqs+pdf PDF link annotation
    • http://bestgirl69.com/producer_equilibrium_in_economics1ur0h.pdfIn PDF document text
    • http://xodinazafomizi.22web.org/pexus.pdfIn PDF document text
    • http://lefuduzitenazig.22web.org/centralized_management_console_hp.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/potor_zinezebapolowom.pdfIn PDF document text
    • https://dujolisinapujis.weebly.com/uploads/1/3/4/3/134328324/2659332.pdfIn PDF document text
    • https://waguxezemi.weebly.com/uploads/1/3/4/7/134703223/5419325.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496374/normal_60012131d9dde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416322/normal_60296d4ce0ddd.pdfIn PDF document text
    • http://pubolovuwete.iblogger.org/houses_of_parliament_english_guided_tour.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450506/normal_60276b226f5d4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456378/normal_6008cea61821f.pdfIn PDF document text
    • http://remontlegko.info/within_subjects_design_vs_betweenu3ojj.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jimanujomubil.epizy.com/data_analysis_methods.pdfIn PDF document text
    • http://gukofeverozek.rf.gd/moon_river_chords_fingerpicking.pdfIn PDF document text
    • http://xewaxal.epizy.com/michelin_guide_restaurants_los_angeles.pdfIn PDF document text
    • http://sizikipap.epizy.com/22868937958.pdfIn PDF document text
    • http://kazixovo.rf.gd/gijuvufenenuri.pdfIn PDF document text
    • http://dodigemadepa.epizy.com/sazipomewogutegi.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E1 6992 bytes
SHA-256: 7213594367bb076a2ea4cfce9e21a6ee6bd51908590e8aeeb8868ed5e1cc9d95
font_01_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 4124 bytes
SHA-256: 9b117463bd9ce9d4afd25c2ac9c0804b8960ad8f107eb41f53824fb9a2b1ebaf
font_02_sfnt_off00012a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1D 2008 bytes
SHA-256: 19ac4eed548a85b47332f81aa6c6e6a115c8e991ad518a1d194033808f398bd9
font_03_sfnt_off00013378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13378 5428 bytes
SHA-256: 5776f563b88fcfb4887a3ca230f1cfc37612d21d4b5ac21f0f9a91e0a34d962c
font_04_sfnt_off000145c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C1 18976 bytes
SHA-256: 099ada9f1c1530ee39878fc3c5eac2776d9c8aa26f9fde66e3580ef201d977f9
font_05_sfnt_off00018118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18118 16908 bytes
SHA-256: 5c2fa7c1696330b813f7cb4b607fdc4a7f110f24af4180aafeabfcc7d3f97720
font_06_sfnt_off000198fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198FE 6320 bytes
SHA-256: a6e7d8413865f273b92d90dde15d0dcfdb86d6b704a55a6e36932e0c86987dfa