Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b423bcb30d3b970…

MALICIOUS

PDF

86.2 KB Created: 2021-03-18 14:23:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 40ec00a008a2dc773461a9c4a1ba72e9 SHA-1: d51446a0dd118cfc5f1c6fb94ea3fd72a8e1196e SHA-256: 0b423bcb30d3b97066539fadf4a6c2b64d3f203512333cbc177841eb6bb1666e
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains numerous embedded URLs pointing to various domains, many of which are hosted on disposable or free hosting services, suggesting an attempt to obfuscate the ultimate destination or distribute malicious content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the sample as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/strik?utm_term=plantilla+carta+gantt+simple PDF link annotation
    • https://cdn.sqhk.co/batumozi/Yyicihg/autonics_panel_meter.pdfIn PDF document text
    • http://dujojiwasemob.mywebcommunity.org/kodojaxeputuker.pdfIn PDF document text
    • http://xazivigufimu.22web.org/bear_river_colorado_fishing_report.pdfIn PDF document text
    • http://revujutipisan.22web.org/22809584293.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/idgiRgi/liwafewilasekutidob.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenerusivu/agjibie/here_comes_the_sun_sheet_music_violin.pdfIn PDF document text
    • http://rotiwopofeze.mywebcommunity.org/miwakonefuporin.pdfIn PDF document text
    • http://wurulef.22web.org/gta_san_andreas_cheats_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/djF9gdf/cosmis_racing_xt-_006r_18x9.pdfIn PDF document text
    • http://xejikunibe.22web.org/atomic_structure_class_8.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuwusogoxo/idjdicv/xuxevide.pdfIn PDF document text
    • http://mazoxobiziwikut.iblogger.org/78147114972.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sonasekofuxix.rf.gd/mathematical_physics_book_by_satya_prakash.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/23760541866.pdfIn PDF document text
    • http://kewivifonawati.epizy.com/10733078801.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/how_to_get_rid_of_a_rash_on_my_newborns_face.pdfIn PDF document text
    • http://biborufa.epizy.com/65780475243.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/16578075499.pdfIn PDF document text
    • http://livofos.epizy.com/28213580410.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/2005_cts_v_transmission_removal.pdfIn PDF document text
    • http://sozidimimu.rf.gd/nature_s_answer_vitamin_d3_drops_review.pdfIn PDF document text
    • http://vakogez.myartsonline.com/73001595917.pdfIn PDF document text
    • http://zonatitusajobo.onlinewebshop.net/jurepix.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_off0000fdef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEF 5256 bytes
SHA-256: 50bdc2dfb5e0d3a02c8e9bcc34d7501067b29440584ec478e8ab8f9f46f648f4
font_01_sfnt_off00010fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB9 11708 bytes
SHA-256: 7bfde1e0b8c003729466d1def4f8568b9cc0cf01738c04fb9a7bde834fd9d1f5
font_02_sfnt_off0001361e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361E 16060 bytes
SHA-256: df1d2c903cabdf2976887e260da0b25217edeb5ce2b71f315001024534e8e210

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