Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfa63b65fc1b44e3…

MALICIOUS

PDF

70.6 KB Created: 2021-03-04 08:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2b4d9b7dcf6870f37da93bbe6729d07c SHA-1: d4aa153992bb15a2984e33b1e7a826b86404c99b SHA-256: bfa63b65fc1b44e3075298a6676da4de8f757c1f4e889a3dd3edcecd786604a0
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 0.9998

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://mezovuduw.ru/strik?utm_term=tabla+periodica+de+los+elementos+para+imprimir PDF link annotation
    • http://lifizix.22web.org/bokuvod.pdfIn PDF document text
    • https://kugugurufive.weebly.com/uploads/1/3/4/1/134108893/973917.pdfIn PDF document text
    • http://gigazukiwizave.22web.org/flywheel_energy_storage_system_design.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/8iiGvjj/last_minute_carnival_cruise_deals_from_baltimore.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/oIjalSm/atif_aslam_old_songs_unplugged_download_mp3.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/navubuxekusi.pdfIn PDF document text
    • https://cdn.sqhk.co/xovepejegosi/sieY3ih/motorola_baby_monitor_app.pdfIn PDF document text
    • http://bogaxusamukuxid.22web.org/fukunuvetovefuzaleno.pdfIn PDF document text
    • http://romabeveseruzor.22web.org/medios_audiovisuales.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejumajiluwod.rf.gd/can_i_renew_my_cdl_permit_online_in_ny.pdfIn PDF document text
    • http://vapanuwivodoj.epizy.com/fobivetatojata.pdfIn PDF document text
    • http://vozuxekeve.rf.gd/javafx_css_cheat_sheet.pdfIn PDF document text
    • http://rojanesifilagu.myartsonline.com/widafefojugukafuxotekuziv.pdfIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/zogataxelapanefapubujul.pdfIn PDF document text
    • http://josekopiguvalup.epizy.com/49410985329.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/dante_s_inferno_movie.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD620 5308 bytes
SHA-256: 69a65b4ff239e8d0faf9c84450b7f1399c5329ac90cebed33961bb4c95cf2225
font_01_sfnt_off0000e809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE809 10916 bytes
SHA-256: c3af43e5e8dfda784b97ffe3917810c77e69dad52be6a6f607bcf668e893c060