Malicious PDF — malware analysis report

Static analysis result for SHA-256 93f2160379ce7e08…

MALICIOUS

PDF

89.6 KB Created: 2021-03-20 02:51:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38587ff00c99a9fa5763ded732d9e2cd SHA-1: 37db4d602d60c82d45ad668f95010614a8f6a47c SHA-256: 93f2160379ce7e089bb6676582e8540a476997ee9959eaa792008018b7c02547
186 Risk Score

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 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.
  • 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://crophysi.ru/strik?utm_term=how+to+put+a+needle+in+a+record+player PDF link annotation
    • https://cdn.sqhk.co/wofamofupu/3jcicqG/56645572390.pdfIn PDF document text
    • http://wutujirola.22web.org/romofigaz.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/f9BhurW/iron_golem_mod_for_minecraft_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/zoraxiraga/jbgckhh/school_bus_cartoon_picture.pdfIn PDF document text
    • http://xopasiwaxenoj.iblogger.org/50381772660.pdfIn PDF document text
    • https://cdn.sqhk.co/gidagolusi/jP9eEgd/toon_blast_game_cheats.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409797/normal_6024fb6cdb877.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/how_to_fix_ge_microwave_turntable.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/how_do_spell_slots_work_with_multiclassing_warlock.pdfIn PDF document text
    • https://cdn.sqhk.co/febowozefu/alZhiAk/digabox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368235/normal_6016388b7cd4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382784/normal_600a67bb3047d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384159/normal_5fc6185038ea1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d74058ad-8c31-4576-aeb4-582a73b10e1e.filesusr.com/ugd/666c83_d7823874ea08485e9a7b7c19aa92fbdb.pdf?index=trueIn PDF document text
    • http://pijularof.epizy.com/email_signature_template_photoshop.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/zibexorufadazupeterota.pdfIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_1e3bddbf745c41079aeb392ca8121ea1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5993776-90b6-4e2c-9184-70fd4f8d85d1/29826672049.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e55f641-93c0-4ffb-8891-15b78e471d57/how_many_calories_are_in_an_arbys_slider.pdfIn PDF document text
    • https://f9a132f0-acc9-4761-b7d8-38025aedd849.filesusr.com/ugd/5c71d6_9396b64bd15847529f4cae9e79fef1ca.pdf?index=trueIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_917d0de2903d4f22882c106c5df830d1.pdf?index=trueIn PDF document text
    • http://gexijobuvakoxob.rf.gd/gramsci_prison_notebooks_sparknotes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C99 5044 bytes
SHA-256: 13c2013448489a7505b3397f27341fddfd6674e005ff2db39e48f9646df8aa9f
font_01_sfnt_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 10640 bytes
SHA-256: 5bd601a2cd2aa619485a34d344675951fa0bd512127134ef1f5b39d83df3bd2e
font_02_sfnt_off0001428d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428D 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501