Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603a03631fc85c5…

MALICIOUS

PDF

119.6 KB Created: 2021-03-22 12:02:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0af7ec6a4a26b1ceb379e64d3f43084e SHA-1: 6822c49b2c443a6848e46ecad8478d74e87bedbd SHA-256: b603a03631fc85c5335f3fbff36ca34a07679d38e8bb57180f7fb0428df0dbea
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xajibur.ru/strik?utm_term=pokemon+adventures+red+manga+pages PDF link annotation
    • http://baxebeteziwetu.iblogger.org/cursos_de_ingles_gratis_en_dallas_texas.pdfIn PDF document text
    • http://pisazujinatef.iblogger.org/canon_in_d_major_guitar_tab.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a45ef2-56c5-431f-a19f-23fced90c4e1/79209264613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c50168a-996c-4a84-9a71-f522d943d820/21178799936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb305324-2f82-4743-8639-842362b65b5c/netgear_prosafe_gs108pe_default_login.pdfIn PDF document text
    • https://s3.amazonaws.com/lewuli/8255004652.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/84030805468.pdfIn PDF document text
    • http://fuzimobikuxuta.epizy.com/allen_bradley_powerflex_4_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d891c37-3f4e-4184-980b-e8515b0195ff/17286348807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b081f6b6-963d-4c0e-80dd-748c28649548/how_to_restore_corrupted_data_on_ps3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/718c48aa-1ddb-4aef-81b8-1eabe0979ce1/order_to_read_elric_books.pdfIn PDF document text
    • http://vetovolixexa.epizy.com/2302683194.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/ingenico_iwl250_terminal_user_guide.pdfIn PDF document text
    • http://labotiz.rf.gd/zujifefaru.pdfIn PDF document text
    • http://roragopijejem.epizy.com/nintendo_ds_pink_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/how_to_renovate_a_mobile_home_kitchen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2400fed-acc8-4565-830b-eb94f7cb3c1d/royal_210dx_cash_register_ink_replacement.pdfIn PDF document text
    • http://retuguru.epizy.com/casio_ga_1000_4aer_manual.pdfIn PDF document text
    • http://vumarolewe.epizy.com/ziloxokixaz.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/pajiwamepewasuvo.pdfIn PDF document text
    • https://s3.amazonaws.com/veledabejufi/bluestacks_android_emulator_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/academic_word_list_570.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbd21f34-217f-43e4-bf14-6068e8381b74/what_is_a_layer_2_switch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d1f2577-ff78-46ef-9df5-564a28e0bd06/6704143668.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000175d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175D0 9120 bytes
SHA-256: 255ef6dfea4fd18b472608eb931e3eb6d13f606393910902a55930a524de0ed2
font_01_sfnt_off00019478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19478 5372 bytes
SHA-256: cef7679efdde8e8dc077267224285281d7508ce096cb7975f61d68711b9e1d60
font_02_sfnt_off0001a6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B9 12056 bytes
SHA-256: 8da15ff81d3a8553483eaef4ecf5556d7dfa8fe03563987822b9ac397ee9421b