Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfb94fd667c574d…

MALICIOUS

PDF

75.8 KB Created: 2021-03-10 09:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4baa7b6d08b0141b3b419db5c7ad2ebd SHA-1: 266729b1506f26f3904b6548a09d4ea0bdf0c44a SHA-256: 4bfb94fd667c574d7eaea3e92a7b7600c38f294e76f26bf98909dd4284d88f29
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 0.9997

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://soxebez.ru/wix?keyword=maytag+commercial+washer+maintenance+manual PDF link annotation
    • http://qwertyujg.xyz/45266691477ur8ok.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/que_significa_estilo_de_vida_occidental.pdfIn PDF document text
    • https://luwozupewudaxu.weebly.com/uploads/1/3/1/3/131384663/bipemusomadasa-guzopuki-lizarinobopuzot-sunepudigajo.pdfIn PDF document text
    • http://jowuguzipupuv.iblogger.org/wixurafisamazeg.pdfIn PDF document text
    • http://pubafagare.22web.org/foot_and_ankle_strengthening_exercises.pdfIn PDF document text
    • http://helpverifedbadges.com/zondervan_bible_dictionary_downloadny9x6.pdfIn PDF document text
    • http://giwosoto.sportsontheweb.net/vavarimajurixisezikepep.pdfIn PDF document text
    • https://mebodamuruwij.weebly.com/uploads/1/3/5/4/135400263/tuminuvemamogi_tulir_kitobadibidefij_nozoxavoser.pdfIn PDF document text
    • http://muxonobugimaki.22web.org/bootstrap_templates_for_forms.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/how_do_i_fix_the_pick_motor_stalled_on_my_hp_8600.pdfIn PDF document text
    • http://kazuxigunifaz.22web.org/31035620909.pdfIn PDF document text
    • https://rixutabenenik.weebly.com/uploads/1/3/4/4/134498467/sidatipapukiful.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tomedokuboder.epizy.com/6754072047.pdfIn PDF document text
    • http://rekekolulopar.rf.gd/what_is_the_house_with_a_clock_in_its_walls_about.pdfIn PDF document text
    • http://fuxunowelujuxa.atwebpages.com/what_happens_in_chapter_13_and_14_of_the_giver.pdfIn PDF document text
    • http://xetatiwu.rf.gd/all_my_loving_guitar_sheet_music.pdfIn PDF document text
    • http://kagijido.myartsonline.com/all_in_one_pc_touch_screen.pdfIn PDF document text
    • http://derekage.epizy.com/nibuwegitapojokuje.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/1_000_places_to_see_before_you_die_spreadsheet.pdfIn PDF document text
    • http://zalezir.epizy.com/lakabifozerugiwezabak.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_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 5412 bytes
SHA-256: bd165b1e62a0126d115b967b8b42b88e06470b497365679ac32c115f5d7becdd
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10264 bytes
SHA-256: 711f2e0ca4b3f095364c61ab5b33e1de6c45d4fea1b77312628882c7b328fe74