Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fc942fb218319d…

MALICIOUS

PDF

70.8 KB Created: 2021-03-14 15:16:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5acf01fd3c8c6dbb2586266ff24a4ca8 SHA-1: 9ff87e7a3e2b4bc109bc682d444c91d1858cbd2a SHA-256: 37fc942fb218319d1a87b486b209b8adf7422e662ae605cb3054fb06a4bb4f96
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 0.9959

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://zajinet.ru/123?utm_term=teclado+diccionario+espa%25C3%25B1ol+android PDF link annotation
    • http://xoziduso.mypressonline.com/4217304762.pdfIn PDF document text
    • http://tubipegutadob.iblogger.org/alan_watts_books_best.pdfIn PDF document text
    • https://bejivuvepezera.weebly.com/uploads/1/3/4/4/134437422/4780839.pdfIn PDF document text
    • http://jafoxidulez.mypressonline.com/93803510684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368752/normal_5fd675b4bab9b.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/2b73552f565e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413842/normal_602d2cd8b44a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389108/normal_5fd185a3f1e7a.pdfIn PDF document text
    • https://fezewemekerod.weebly.com/uploads/1/3/6/0/136050953/678699.pdfIn PDF document text
    • https://meboropob.weebly.com/uploads/1/3/2/7/132740462/299bcdf09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_6046899782d93.pdfIn PDF document text
    • http://wunuxuvi.sportsontheweb.net/poduxawix.pdfIn PDF document text
    • http://fesunasisodenod.getenjoyment.net/55364430849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365624/normal_602e99566ece2.pdfIn PDF document text
    • http://pajugurujuvavux.22web.org/the_cask_of_amontillado.pdfIn PDF document text
    • http://riwotivadejud.sportsontheweb.net/python_scripting_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422135/normal_603ad1a15f3b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_604476bc85908.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444369/normal_6021629d797ec.pdfIn PDF document text
    • https://dipalowijoje.weebly.com/uploads/1/3/0/9/130969855/mofutom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://01d67eed-50ba-4ccb-8f82-c1581f7ed07e.filesusr.com/ugd/e3325f_6a509165f198448eb205f0a80a02f988.pdf?index=trueIn PDF document text
    • http://volulel.rf.gd/98415251046.pdfIn PDF document text
    • http://rukotig.rf.gd/equations_of_motion_notes.pdfIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_646b899656db48a6a4a52a256ac79667.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_64143687b45d4347ae1b27fcbd4a8c51.pdf?index=trueIn PDF document text
    • http://zunimesigo.rf.gd/badirolafususameti.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_off0000d5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AA 5228 bytes
SHA-256: 370dddb7b0a93d77af277e2dca5930b50953b9c845008943496e150055c2b40e
font_01_sfnt_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 11032 bytes
SHA-256: f5280f6794ad943cc352e5c88259ba2b9166ef7db2353b760ceebac6ce3013c4