Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb46ceb161a6410…

MALICIOUS

PDF

77.7 KB Created: 2021-06-15 12:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a732b6b05d57f4fa81c85859b1738cf6 SHA-1: 04c46a2cfc962da98c6e30a3df6fde0184ab8262 SHA-256: dfb46ceb161a64108bcafa1f39dc2bedc9e19f1255f898df9f2689059cdd55b7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'smidgel.ru' and disguised as a download for 'A wrinkle in time 2'. Heuristics indicate this PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. The presence of embedded URLs suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/pbw?utm_term=a+wrinkle+in+time+2 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5ff069faa6a43.pdfIn PDF document text
    • https://faxilazow.weebly.com/uploads/1/3/4/7/134725206/wozogu-jumose-kukebidujud-zoser.pdfIn PDF document text
    • https://zunurevupuvofas.weebly.com/uploads/1/3/1/4/131438471/2607771.pdfIn PDF document text
    • https://jajamavufivaz.weebly.com/uploads/1/3/4/2/134235884/pimivegade_puteg_zejevitanu_xisinijipedigo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482848/normal_6045507b075b0.pdfIn PDF document text
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/manegu_jawapajal.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4378161/normal_60b6d5c66fadf.pdfIn PDF document text
    • https://zofijakifixanow.weebly.com/uploads/1/3/4/6/134677560/lazosenomusilos.pdfIn PDF document text
    • https://nivasotum.weebly.com/uploads/1/3/5/9/135991747/juzote.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_604f06e5a58af.pdfIn PDF document text
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/35e60d59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_602bb31681feb.pdfIn PDF document text
    • https://bigakobavivab.weebly.com/uploads/1/3/4/7/134747120/433379.pdfIn PDF document text
    • https://juwalonivegab.weebly.com/uploads/1/3/5/3/135309433/mabepulilamur-kabimamiw-xenasud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466676/normal_60bf89773e6d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413467/normal_5ff2752a4b793.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494875/normal_605d4a2bc17dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/2020_kia_soul_manual_transmission_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb88dff4-921a-4eb2-b9f8-4f928353a661/bawoxelalowopubalegarazu.pdfIn PDF document text
    • http://funasazixi.pbworks.com/f/understanding_and_using_english_grammar_5th_edition_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19479515-5cc9-468e-99c5-244f1366b9a2/novikuxazosesasizabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/360136ef-41db-4fb8-a090-a5ed67f733c5/67001074157.pdfIn PDF document text
    • http://vinukena.pbworks.com/w/file/fetch/145062915/55985969756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35458f50-3ba5-4311-8d71-769359f8b736/botadujoki.pdfIn PDF document text
    • http://texuxokubu.pbworks.com/w/file/fetch/144905973/old_classic_tamil_movies.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/pimiwixab.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_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 4720 bytes
SHA-256: 308d74478764205f6637a62066e2634b786f3296a022c2c0d2976c3f6d92053a
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 10776 bytes
SHA-256: 900dfffadbe716c9156857b3d9c14f53bc755b3f9179d832c96b89f0029e6e98