Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc1611a83d5cfb1…

MALICIOUS

PDF

68.6 KB Created: 2021-03-14 15:03:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e1c99f6a44aace688e76d6895b582660 SHA-1: 1017a763a91fca7bec1ad964f8c87b845d9ffb1b SHA-256: 4fc1611a83d5cfb14495081468cbd58a9658b175188ac25f07e101ca4635773a
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 0.9992

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://maypoin.ru/wix?keyword=rainy+death+persona+4 PDF link annotation
    • http://tujemet.scienceontheweb.net/vigazifowesasusuzi.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/idhegfB/xagupipuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/banijuwa/kyVhegf/fopito.pdfIn PDF document text
    • https://cdn.sqhk.co/nifijagik/4RheigM/xoxenisinunigovumamizes.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/65095325371.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457838/normal_5fec873bbbed3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449965/normal_602c8429e5dc9.pdfIn PDF document text
    • http://redirerer.medianewsonline.com/moon_river_lyrics_audrey_hepburn_chords.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_602e288f2da97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454170/normal_602028675659a.pdfIn PDF document text
    • http://faxusupovetek.sportsontheweb.net/good_basketball_plays_names.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/24293069-e29f-45a7-8b23-a38e0d4d4c46/xuvumuzamixemetinadonase.pdfIn PDF document text
    • http://lojubefogugiku.onlinewebshop.net/ecologia_factores_bioticos_y_abioticos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16039456-b648-4693-9c8b-d956c37a4084/56723405097.pdfIn PDF document text
    • https://8c805f22-5240-4a8e-9b4d-8499607ff1fc.filesusr.com/ugd/76156b_357ee498704d4cc8b566416a103b03ce.pdf?index=trueIn PDF document text
    • https://923a8ca3-316b-4844-b38f-9bc955ad4852.filesusr.com/ugd/312e0e_bec51f44c2eb453eaf1221eb14a914c5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fde697-0095-4033-9ecf-2e3488c32545/the_boy_in_the_striped_pyjamas_book_short_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b47fa64d-4231-4f53-9791-2847e1d40bcc/lajipijebiwufi.pdfIn PDF document text
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_50fe5235a6b84f0bbc11c296457ddac2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57b76b65-b489-4730-be34-fcabf93742c9/jawibat.pdfIn PDF document text
    • https://5cbbff6b-7c47-4fbb-abda-9de5069fbc88.filesusr.com/ugd/1a89c8_251c54a1f2284b44a3a03ea2ef26f0d9.pdf?index=trueIn PDF document text
    • https://bcbc83ff-a82b-4234-bf1d-c69e8cae54d5.filesusr.com/ugd/057c82_38d50e0b52674acf8c32317466bc2d61.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c66a5d9-53e6-408d-8706-7efe7207b3aa/libumijakewurexete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcf6d564-5abe-4e01-9ab5-847fb9b1bd24/what_does_the_nursery_symbolize_in_the_veldt.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD042 5212 bytes
SHA-256: ed9c45d98fff08c4d0b042be140b55f08227213577c1f98848287c47674717a8
font_01_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 10316 bytes
SHA-256: 761d0b785637f30cdde9bcc2fc48de262d3ede5d65ba2aaf8668ff0e416b9a32