Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3d983078b3d1a0…

MALICIOUS

PDF

76.0 KB Created: 2021-03-29 05:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4290b71929ff1bd27d66c615faf48679 SHA-1: 3044870cc312050aa0e435a3b95b4af6403023b0 SHA-256: 8b3d983078b3d1a07f8b5f4b04b8813160cd57ca9874cf61eeca995ff8194904
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of outbound links designed to manipulate search engine results or direct users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://dugedepap.ru/strik?utm_term=outline+how+breast+milk+is+produced PDF link annotation
    • http://dasiroxejipi.22web.org/zexaxoluwafitidaxesoxiwok.pdfIn PDF document text
    • https://pudijeda.weebly.com/uploads/1/3/4/5/134586696/881e1.pdfIn PDF document text
    • http://dotekebenutedex.scienceontheweb.net/satellite_communications_companies.pdfIn PDF document text
    • https://jaduxokapatusiw.weebly.com/uploads/1/3/5/3/135301375/b74b2ebfeecb.pdfIn PDF document text
    • https://wakaxizuso.weebly.com/uploads/1/3/5/3/135322555/xenilukisujeruj_kefag.pdfIn PDF document text
    • https://tumofevex.weebly.com/uploads/1/3/2/7/132710745/5f2222afd2c.pdfIn PDF document text
    • https://vesumuzuvof.weebly.com/uploads/1/3/4/6/134685641/2229267.pdfIn PDF document text
    • https://polalakenasi.weebly.com/uploads/1/3/0/8/130813885/4896804.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pamigobew.rf.gd/vernier_calipers_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/calendario_mondiali_calcio_2018_da_stampare.pdfIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_5f546e9b9d584a768c14a2226b9f6472.pdf?index=trueIn PDF document text
    • http://pekafujojef.onlinewebshop.net/90822270570.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/3563465655.pdfIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_ff2a19159aed415c846c469edec38e73.pdf?index=trueIn PDF document text
    • http://tojikesopi.rf.gd/how_to_draw_a_face_easy_for_kids.pdfIn PDF document text
    • http://suremosanox.rf.gd/revakejitokazufilil.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/indian_army_full_hd_wallpapers.pdfIn PDF document text
    • https://3d5b2cfc-74f5-4c02-8466-0d369b02955c.filesusr.com/ugd/69b86f_5ac7921353044e42b9c80c6ad88295ba.pdf?index=trueIn PDF document text
    • http://rawonisobux.rf.gd/l_alphabet_russe_traduit_en_francais.pdfIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_2db726fdd09d4d09ad66b12cf9c98e21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/evolution_plunge_saw_guide_rail.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_off0000ebb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB8 5636 bytes
SHA-256: 6d0ac14759f9ea78dc9cdd7c4804add54107db0d3279b91d9083bf92c0fd7e86
font_01_sfnt_off0000feb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 10392 bytes
SHA-256: 37d6cd794b99a8ca48db7cfa2175e8194e7f8377daf30790eb8a8dfbe7040812