Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e79cf543e2913c9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-19 14:55:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 74bd063201a20874ea3a97ec166a69aa SHA-1: 83687136fccc436e7991c5442b56a4bfa5730c2b SHA-256: 9e79cf543e2913c91fb7b5d8d0da3d57fd3bef8c9fe1b417cbbfb0f965f5810a
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/aws?utm_term=dell+1905fp+monitor+specs PDF link annotation
    • http://vertigoa.online/organic_chemistry_book_paula_yurkanis_bruicegkqbx.pdfIn PDF document text
    • http://qwert-ita.fun/6063403037333nvr.pdfIn PDF document text
    • https://jazuwexakabe.weebly.com/uploads/1/3/2/3/132302764/lirejuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457279/normal_60526efb306d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488346/normal_5ff33b73d5996.pdfIn PDF document text
    • https://bogezozoxo.weebly.com/uploads/1/3/4/4/134479702/1043127.pdfIn PDF document text
    • https://nilijinaxobizag.weebly.com/uploads/1/3/4/3/134356504/durubefazameto_vavijetumav_bekevigit_malovolujivak.pdfIn PDF document text
    • https://fuwodeku.weebly.com/uploads/1/3/6/0/136095673/6434e6f26cb25a2.pdfIn PDF document text
    • http://5coupons.info/449590810768pxkn.pdfIn PDF document text
    • http://barberking.best/milwaukee_2797-22_m18_lithium_battery_combo_kiteif9z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478688/normal_60143b26b8d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365553/normal_5fe6121cf23f1.pdfIn PDF document text
    • https://bajarewejewud.weebly.com/uploads/1/3/4/6/134673735/5790532.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451567/normal_5fe124189cf31.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/9e109491-3b36-4a2f-a9eb-17b160bb51d0/what_is_boy_scout_motto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7db07b0-ca63-4a6d-bcae-8061eccb9297/vegetis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b8068c6-a463-47b2-ab05-9371886052a8/pipe_fitters_blue_book_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5726f3a5-da20-4fc3-b9fe-d117e6b06fe9/best_online_crossfit_training.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de284fc5-b536-4057-aa13-113b4ef16f13/icom_ic-7200_best_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab528b91-47fa-4d62-ab15-a783764d4b42/15895103953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ee8c732-4ae8-45a0-aacd-1d9d03f7bee8/84057617469.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65bbf2d1-bc86-4e62-b5fb-de76cee31a14/36296326981.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_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 5424 bytes
SHA-256: 8b9a6e824a05f743e5733a34940430dd4aa2fcb2b1b0a6391f6245ba336bc3d6
font_01_sfnt_off0000ff55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF55 12004 bytes
SHA-256: fe9cdee9b5b07c4cb47189d997a1e4ef6e185ebe16d0b86ab83e0c5886e1e1df