Malicious PDF — malware analysis report

Static analysis result for SHA-256 746e59e8ea496f35…

MALICIOUS

PDF

79.0 KB Created: 2021-04-24 22:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e2e79e2c9f56eebe27159b338e69ae1c SHA-1: e2170f13f165623f44f62f940e30569262224f80 SHA-256: 746e59e8ea496f354cb82be9b0652dddb9a2e8915d20d1a272181f2e144448dc
126 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The document body, though partially corrupted, contains text related to a play summary and the wkhtmltopdf application, which could be a lure. The presence of external URIs and the link farm heuristic strongly indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/strik?utm_term=resumen+de+la+obra+buenos+dias+princesa+de+blue+jeans PDF link annotation
    • http://fuxisileza.mywebcommunity.org/how_to_operate_sanyo_air_conditioner_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/jcb2gj5/viwaxuvibipopo.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/jjbjbnG/truck_driver_city_crush_mod_download.pdfIn PDF document text
    • http://bagidopivulo.mywebcommunity.org/jewotod.pdfIn PDF document text
    • http://labebatazavanoz.mygamesonline.org/cardinal_sarah_la_force_du_silence.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_3fdd7f98b7fc4076be0de9823517df1b.pdf?index=trueIn PDF document text
    • http://jurizamumi.myartsonline.com/americo_castro_el_pensamiento_de_cervantes.pdfIn PDF document text
    • http://sokobob.epizy.com/31706292365.pdfIn PDF document text
    • http://pixafur.atwebpages.com/chapter_viii_first_stage_of_the_revolution.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_b4ee1af53d7140219e2c377c2dce2a33.pdf?index=trueIn PDF document text
    • http://zunimesigo.rf.gd/muxobofelinerigozorem.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_6f6ef097b59a43c98902c51d2edf9c15.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xomudufe/25073394308.pdfIn PDF document text
    • http://wetowotupime.rf.gd/absolutely_free_rental_agreement_forms.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_92e3b982b9864f8d89fc657598061ba4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/cara_game_blade_sword_of_elysion.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/45018003728.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/apple_music_won_t_let_me_album.pdfIn PDF document text
    • http://diwesetudu.epizy.com/24993748786.pdfIn PDF document text
    • http://gilebufamefaf.rf.gd/bhai_bhai_song_video.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_69cbfd7d66b94a8da6bcc24d0d2e44af.pdf?index=trueIn 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_off0000f3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FF 5444 bytes
SHA-256: b6e4b3ad1c3b63016faff310d6bb6df6cc1a48568bddeffe269c3dcae88d1963
font_01_sfnt_off00010662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10662 11568 bytes
SHA-256: 8bf62f5d1d8d9b2823505b8ce165cf0d66674d74f5c9396b51ab26b44739e2fe

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