Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf4b0efa0aaea66…

MALICIOUS

PDF

191.3 KB Created: 2021-03-23 00:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b5d8fa7b2c43bbdd53eab3ce7f5d52b4 SHA-1: 9a2bca093eb3370f11062b4325fe8e7003ebacea SHA-256: 4bf4b0efa0aaea66572e427489d4236f788ce8b1086871618ee2842651b2622a
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 0.9906

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://fokemale.ru/123?utm_term=blur+background+psd+free PDF link annotation
    • https://cdn.sqhk.co/nujidegowupi/YlyNOia/last_time_dodgers_played_yankees_in_world_series.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/the_scarlet_pimpernel_1934.pdfIn PDF document text
    • https://xefagopabori.weebly.com/uploads/1/3/1/3/131379938/2391845.pdfIn PDF document text
    • http://ziwumaguvogog.iblogger.org/child_clothing_size_guide_uk.pdfIn PDF document text
    • http://novazeku.mygamesonline.org/pidavukoko.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/fYieKij/larujorora.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdfIn PDF document text
    • https://zixojubagever.weebly.com/uploads/1/3/4/6/134613499/805545.pdfIn PDF document text
    • http://penageli.getenjoyment.net/metamorphoses_book_14_sparknotes.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/55000450982.pdfIn PDF document text
    • https://cdn.sqhk.co/noligigibar/Qhhhaid/zadevigosurazasevitivud.pdfIn PDF document text
    • https://zazozoke.weebly.com/uploads/1/3/0/7/130776388/c2585e.pdfIn PDF document text
    • https://pidumiwululixew.weebly.com/uploads/1/3/4/0/134095913/49d7d4.pdfIn PDF document text
    • http://vujakaz.iblogger.org/how_to_make_origami_out_of_construction_paper.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/gcrjdia/download_survival_island_evo_2_pro_mod_apk.pdfIn PDF document text
    • http://bejuzoz.iblogger.org/definicion_de_derechos_humanos_segun_la_onu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e9816b5-e261-4a84-a5c7-594b6999e1c8.filesusr.com/ugd/eb2f7d_f4c386d3b26b46658612ad17d7016730.pdf?index=trueIn PDF document text
    • http://pugobisijutefe.epizy.com/tagegunovisizogolugupud.pdfIn PDF document text
    • http://wekujugom.epizy.com/riscos_ocupacionais_no_trabalho.pdfIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_8267ea594f6748a1a78664ccb2cf2112.pdf?index=trueIn PDF document text
    • http://jizanisan.epizy.com/aadhar_card_application_form_download.pdfIn PDF document text
    • http://dukejujegu.epizy.com/tejonenisevezinew.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_244c557a03ee4dc4b54c9ec514f03fda.pdf?index=trueIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/lupej.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00015f60.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15F60 103172 bytes
SHA-256: 7c18606e1914aabc1489e6675495a3581d2107f841b04d3dbb0a5eeca1866100
font_01_sfnt_off0002901e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2901E 5576 bytes
SHA-256: fef4d9daea24bd0da2d6966eb58acd7e3e43f0afbb0ea9e96844dccd701133a5
font_02_sfnt_off0002a31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A31D 2600 bytes
SHA-256: ee7da1f35661a57b3debe9f08683c1957f1afd5cab009b03668cd742890450fd
font_03_sfnt_off0002adbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ADBC 11628 bytes
SHA-256: c0b109b63d04e42f9ac3d765886ff81ad1b21fedcc739ecb61d4ec2687796834
font_04_sfnt_off0002d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D555 16956 bytes
SHA-256: 356b76e48fab3741f275529fd5b3ce9fb6eb87187e4e589b096ee49aaf16ccb1