Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1cdc15421929792…

MALICIOUS

PDF

88.9 KB Created: 2021-03-06 08:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 585cad2b8adb83d967226ac2554c23da SHA-1: 14cc0f402338ac3fa2562831ab38263dba4521d1 SHA-256: d1cdc1542192979241008732d93a1db173139223d384f72400260f5458ce4f13
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. Although no scripts were extracted, the presence of numerous links and the heuristic firings suggest a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=malayalam+amar+chitra+katha+free+download In PDF document text
    • http://hookup755.fun/871337837594vj1k.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/nivoxomivavakugexumus.pdfIn PDF document text
    • http://jevafurevozu.mygamesonline.org/roland_xp_80_manual_download.pdfIn PDF document text
    • https://bekariniwoxisit.weebly.com/uploads/1/3/2/7/132710774/lunerefuluse.pdfIn PDF document text
    • https://cdn.sqhk.co/kimefutif/iacdMXC/fotigino.pdfIn PDF document text
    • http://itawegan.space/status_video_krishna_bhajanlm83n.pdfIn PDF document text
    • http://pikegupima.medianewsonline.com/onn_tv_codes_for_cox_remote.pdfIn PDF document text
    • https://cdn.sqhk.co/jebumujo/9OS7DLJ/dr_dean_ornish_reversing_heart_disease_diet.pdfIn PDF document text
    • https://cdn.sqhk.co/rivotoxupow/jhiiays/wakesurfing_mastercraft_x2.pdfIn PDF document text
    • http://yoganchik.space/kuensel_calendar_2019_downloadj1dj1.pdfIn PDF document text
    • https://disaximineta.weebly.com/uploads/1/3/4/8/134883765/1eb515c9fbc.pdfIn PDF document text
    • http://pedagodogiko.getenjoyment.net/56855098653.pdfIn PDF document text
    • https://jenafowumavadas.weebly.com/uploads/1/3/1/4/131437472/wizevoworekutenazez.pdfIn PDF document text
    • http://relax35.ru/voxowetenogapasuxixakoni0fjoi.pdfIn PDF document text
    • https://cdn.sqhk.co/vekunego/ggc4M5M/ben_10_up_to_speed_free_play.pdfIn PDF document text
    • https://wuvobarapupi.weebly.com/uploads/1/3/0/8/130813490/vonavegadikijazut.pdfIn PDF document text
    • http://miwasigal.mywebcommunity.org/american_heritage_idioms_dictionary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://saxodanokijaj.atwebpages.com/how_to_differentiate_between_bacterial_and_viral_throat_infection.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/doxeladi.pdfIn PDF document text
    • https://s3.amazonaws.com/timituvupame/the_definitive_arduino_nano_pinout_diagram.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/percy_jackson_become_a_god.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/65461829372.pdfIn PDF document text
    • http://sabixukavizom.myartsonline.com/how_to_get_surface_area_of_a_trapezoidal_prism.pdfIn PDF document text
    • https://s3.amazonaws.com/loneminovu/how_to_calculate_pipe_volume_in_gallons.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/tixaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/28292745581.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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 5132 bytes
SHA-256: d64b6d0191af28fce8df3d9b1928c642567c7bcb347d099f3af7ffedd1b3641f
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 4148 bytes
SHA-256: d40a190840ae28fa1df87bc719e25c11a9261b37f599b040a6a689b3ff141e52
font_02_sfnt_off000112b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B2 10208 bytes
SHA-256: 6cff82b9751524b5f4ada41c318d33e95de860060aff544369588505517d9579
font_03_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
font_04_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 4596 bytes
SHA-256: 2d78f733cde7b5a556c45ac585d87eb8e15290131586c071325e9b34b15e4e94

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