Malicious PDF — malware analysis report

Static analysis result for SHA-256 138b45436cd0d484…

MALICIOUS

PDF

90.5 KB Created: 2021-03-18 19:30:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7faf1fb4f3167240f206006896c686f0 SHA-1: c4622af89e3637828fd2f24d795898258db41ba5 SHA-256: 138b45436cd0d484b637edd18bdcf36e8cb1511b6128d0dc0443a6a941f70175
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded links are indicative of a phishing lure, potentially leading to a malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://yafferge.ru/wix?keyword=finding+volume+of+cylinder+cone+and+sphere+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wuvepilamamuse/driver_impressora_hp_laserjet_pro_400_color_mfp_m475dw.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/avenue_supermarts_annual_report_2018.pdf
    • https://s3.amazonaws.com/tipikaxe/sutilofadibowevegorujel.pdf
    • https://70848fb0-0fd0-490a-9360-2ffa38fc212c.filesusr.com/ugd/08e331_6df4bf49ac5745a1bcea2ea592e1361e.pdf?index=true
    • https://s3.amazonaws.com/jasadavebaga/artigo_sobre_meio_ambiente.pdf
    • https://uploads.strikinglycdn.com/files/48f16a7a-2156-448d-b3a0-8e45b6f44226/geravefofakijuxa.pdf
    • https://uploads.strikinglycdn.com/files/5360c36a-2dfe-468c-ba10-fc872e9ad088/the_5th_wave_sequel.pdf
    • https://2e9d2e4a-15d5-4529-8b29-235aceea4e08.filesusr.com/ugd/cac96f_438da4d3d73b4b64b2920b2a3b6064fb.pdf?index=true
    • https://0e098354-e5d1-4afc-9be7-763a70ae5e44.filesusr.com/ugd/ef253e_9f3456879ee240cf86d9137cf8edc9f8.pdf?index=true
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_a1f3b89d4eb244e7a1b3c7755bb73fd5.pdf?index=true
    • https://s3.amazonaws.com/zuguvoxoki/dexusogafotusimekade.pdf
    • https://s3.amazonaws.com/dowavelaxam/seduroxopom.pdf
    • https://s3.amazonaws.com/fofeguj/feralis_biology_notes.pdf
    • https://uploads.strikinglycdn.com/files/fd3f0424-c2dd-4614-9512-ad09fb9e3867/oster_regency_kitchen_center_meat_grinder_manual.pdf
    • https://s3.amazonaws.com/mubefula/alexander_the_great_quotes.pdf
    • https://s3.amazonaws.com/vanatul/61706830882.pdf
    • https://s3.amazonaws.com/tosego/pdf_annotator_online.pdf
    • https://uploads.strikinglycdn.com/files/4c42db99-fbd7-4587-81bc-661e78101ce9/what_are_the_main_features_of_report_writing.pdf
    • https://s3.amazonaws.com/rimepusox/wawipiwududijoxonawe.pdf
    • https://uploads.strikinglycdn.com/files/342866fc-f002-48ed-8f63-cd46d8ba030e/what_do_light_bulb_symbols_mean.pdf
    • https://uploads.strikinglycdn.com/files/808adaec-43cf-4b5e-b27d-9216e14fc2e6/74741619649.pdf
    • https://s3.amazonaws.com/nefomojuwet/crystal_report_for_visual_studio_2012_ultimate.pdf
    • https://s3.amazonaws.com/belopudevuzuza/hotel_banquet_event_order_template.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d6e.bin
518a90d46c1757142dc2892e0bb74f80906d20182d2bf7fdbcf926134629c44c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6E 5840 bytes
font_01_sfnt_off0001214b.bin
25c21ee8a5953da14643ab4b70bcea421d693ca7d9d6e616c747dc0360dac5a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1214B 10948 bytes
font_02_sfnt_off000146db.bin
3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x146DB 16096 bytes