Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f45bc2cbf5e7eb0…

MALICIOUS

PDF

83.8 KB Created: 2021-04-23 07:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0661813fa0c2c4ee99952c53eb4624c4 SHA-1: bde5e3956897d047f38fd7a5b0da84fe8a736956 SHA-256: 8f45bc2cbf5e7eb0754b38fbbb6bae2d1dfe6ffa0a4f9f719bb6041da276d9da
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=paige+bueckers+highlights PDF link annotation
    • http://vudasuti.mygamesonline.org/piwukotimogipirikolub.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/sed_command_in_unix.pdfIn PDF document text
    • https://rexanofodifedow.weebly.com/uploads/1/3/1/3/131378899/wodevakefifes_zovox_daxibuzigaz_vapiwajolasibu.pdfIn PDF document text
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/3e63828be63.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/buddhism_in_vietnam.pdfIn PDF document text
    • http://maxiteguf.medianewsonline.com/50804374113.pdfIn PDF document text
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdfIn PDF document text
    • https://gesuveta.weebly.com/uploads/1/3/2/6/132680901/dififun_nokemap.pdfIn PDF document text
    • https://bodarisijusafu.weebly.com/uploads/1/3/5/3/135383154/jekokabudipevig_xidalupanuwe_mufodar.pdfIn PDF document text
    • https://kebumemimax.weebly.com/uploads/1/3/1/6/131636814/72e80b.pdfIn PDF document text
    • http://desokore.medianewsonline.com/sidififebezogif.pdfIn PDF document text
    • http://kowojolajamuv.getenjoyment.net/goviw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://56a79910-2d97-40e4-a1df-bca3b17021d7.filesusr.com/ugd/2721fc_640c8e7daffc47ed9b6f9aecbb855b5b.pdf?index=trueIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_c1dda68a19ef478c91fbcd9f6b96ca16.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/menimulijurasosigig.pdfIn PDF document text
    • https://eda15335-3b41-4752-a6ea-ca28a3d9ec24.filesusr.com/ugd/db55a9_b58e0c10008f43f3928fcb9d4c32826d.pdf?index=trueIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_d895a82c7a6741658f08df2f9dea5e66.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/auditoria_de_sistemas_de_informao_imoniana.pdfIn PDF document text
    • http://xinifaduzinuvu.onlinewebshop.net/what_is_the_new_living_translation_version_of_the_bible.pdfIn PDF document text
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_3778cef9ff6e4be4804986d955cd287e.pdf?index=trueIn PDF document text
    • http://jeximojela.myartsonline.com/atys_c20.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/41016376983.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF28 4932 bytes
SHA-256: 9b0c100dd7d5e52acc7f09cd39ef11099dd64dbe3bf7fd3b746df132619ae656
font_01_sfnt_off00011002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11002 10364 bytes
SHA-256: e3f6c9a0a3ce98c08b36e25f8ab685b7c007816d9c11a9ccb9b2faadb558a396
font_02_sfnt_off0001338c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338C 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378