Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda4498c2b2f8aa…

MALICIOUS

PDF

87.0 KB Created: 2021-03-14 05:11:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0d8fce5ef943a4b3ca1833d66742f01d SHA-1: 490129411121cc9531ba9d71a51acaaa143ed882 SHA-256: dbda4498c2b2f8aa2ca6757e07aa02cfb2dd89f930af33cb94850077097e51f6
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites.

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://jumiwimov.ru/award?keyword=aromaticity+practice+problems+pdf PDF link annotation
    • http://strapslap.online/69844716788xyivu.pdfIn PDF document text
    • https://towoxaji.weebly.com/uploads/1/3/0/7/130740158/b664de.pdfIn PDF document text
    • https://fowawuxubave.weebly.com/uploads/1/3/4/7/134759807/jozesupoxujiwit-valogup-munawil.pdfIn PDF document text
    • http://reestr.site/54883476799rr3ke.pdfIn PDF document text
    • http://baxusajatos.sportsontheweb.net/parelubegolog.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/juzom-mifasiwi-jopobubevadega.pdfIn PDF document text
    • https://ziwuvofoxovexo.weebly.com/uploads/1/3/1/1/131163777/2166042.pdfIn PDF document text
    • http://artdebug.site/brute_force_password_dictionary_fileb6zf6.pdfIn PDF document text
    • http://vereffka.xyz/wojna_polsko_bolszewicka_przyczyny3q4xv.pdfIn PDF document text
    • http://gatorama.site/queen_of_the_damned_ending_explained4pdn8.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/fc672534-dae0-49da-beec-751ef1c72337/nugigaforarasox.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/is_drinking_chai_tea_bad_for_you.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_52d0022a38cd44388b2fb44296d22a38.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_1e29ca4fbc9c464a9fe3a9d54f82e09d.pdf?index=trueIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_9464e91d3ce44ab497570a3274a60abd.pdf?index=trueIn PDF document text
    • http://jisijuvod.myartsonline.com/taxebuzuvif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/241a86a3-15db-43d6-91e2-cf97f545729b/55316638697.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/tamil_songs_ringtones_free_for_iphone.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/vizuzuwaje.pdfIn PDF document text
    • http://nodikaduf.onlinewebshop.net/27739579221.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_59770a73e0d541b3b05c88567b492a02.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/miledu/18765424169.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_off0000fd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD58 5532 bytes
SHA-256: ff7377231d08641bf91300f67158785c909748b14344a14c0938d29f838987da
font_01_sfnt_off00011014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11014 11848 bytes
SHA-256: 3f645f2a41f0bcffe48c4859ce1fb0dd4352ef33336469a55adc786f41fb9ea0
font_02_sfnt_off00013885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13885 16196 bytes
SHA-256: a67efa9f299363cbe4d6488b868fff6b9909d90f66bb91f4253445a114cc03af