Malicious PDF — malware analysis report

Static analysis result for SHA-256 485816efd5417aea…

MALICIOUS

PDF

90.6 KB Created: 2021-04-08 05:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c36b4d2e23e949455596f9bccbc6fd75 SHA-1: d4e204d5c9d2cc1e59287eb5167738cffd3c8d09 SHA-256: 485816efd5417aeaf2a331b1aed5087632b04b96c7fa4275c186af477b52d821
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 0.9996

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://midufefew.ru/strik?utm_term=hush+hush+sweet+charlotte+lyrics+deutsch PDF link annotation
    • http://gasomenuza.iblogger.org/songs_tamil_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/kerutadit/vakhi8J/bejake.pdfIn PDF document text
    • https://cdn.sqhk.co/kodivitedi/Mibjjha/original_dune_trailer_1984.pdfIn PDF document text
    • http://vulifux.66ghz.com/kigolefisizebo.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/gifw9L9/11228303637.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvonazavo/xjgH8bf/digital_media_and_marketing_strategies_coursera_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/fakodozug/hiBhxk2/15712967385.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zasidad.epizy.com/business_management_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a10d9d5-5e01-4d5d-b2a3-3384fc4f9e6f/dunkin_donuts_iced_coffee_with_cream_no_sugar_nutrition.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_5de8a0ac5d3c43849fcddd23d0aed5cd.pdf?index=trueIn PDF document text
    • https://50b7e5d6-ab0e-41ff-bbcb-47d024e5c277.filesusr.com/ugd/45d8ab_11f1e277023b4d339d50f9ec516530c3.pdf?index=trueIn PDF document text
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_c4a87489a38d4cf9aaddd7f61bb951aa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/majestic_ruby_gas_fireplace_insert.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3432c4aa-48eb-421a-874d-5b3a4cb951f9/como_agua_para_chocolate_personajes_pelicula.pdfIn PDF document text
    • https://f98f40d2-b649-4e6b-99af-b89bbf2331ff.filesusr.com/ugd/724bd4_70bb9fb2f6bf4993b0c92acb9f195bc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddcb72b2-bb88-4aa2-9498-19f9d5cfebea/logunepibawuxexawigul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d185f380-c6df-41af-931c-00ab09d8d007/sejuvumazulonope.pdfIn PDF document text
    • https://2a07c75e-e898-48ba-b326-4cccc82d0599.filesusr.com/ugd/ff154e_5fb161338ba24622b5157707ce45ea99.pdf?index=trueIn PDF document text
    • https://042e50b4-45d0-4577-915a-c14d43ab21ad.filesusr.com/ugd/18f527_2d6ad24d87f64d3caedcc8d977638b98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/formation_aide_socio_familiale._lu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44788fa9-6132-4edd-80de-4ee41976f49f/fusutin.pdfIn PDF document text
    • https://7031c68c-cf47-488c-b9bd-b344696616f5.filesusr.com/ugd/51e9e9_f40d05958bea4089b280c0ce23cf8c16.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001228d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228D 5180 bytes
SHA-256: 8ceed617c874ff3d05a3522d5a1a6522eb1bc09bbf703c38a1f5edfa55ad744f
font_01_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 12196 bytes
SHA-256: ad7b88abed1786bbe989f5f9cdad068637a0ec5efd1e876666b076e1d20c1ba9