Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0872c736637a3f0…

MALICIOUS

PDF

84.9 KB Created: 2021-03-17 03:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 91bb84ac63f408f7fe7c5d2032a3384c SHA-1: 2612875363fdc9b76866ba01a14963c23214af9e SHA-256: a0872c736637a3f0ba694daaf313d03fb3613ad188c38f3538c63c88b933c80c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or tracking attempt. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=robin+hood+film+2018+actors PDF link annotation
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/fojed-pexigavepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_5fd30a6034c32.pdfIn PDF document text
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/wunoxu.pdfIn PDF document text
    • http://bitalotava.scienceontheweb.net/woseniko.pdfIn PDF document text
    • http://pixunune.sportsontheweb.net/tecknet_ipad_keyboard_instructions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488330/normal_603e76c9c72f8.pdfIn PDF document text
    • http://zovolexune.sportsontheweb.net/retawelufeseweju.pdfIn PDF document text
    • http://jenuxijaf.mygamesonline.org/machine_learning_book_stanford.pdfIn PDF document text
    • http://pobadabodoz.scienceontheweb.net/convertir_milmetros_a_pulgadas_cubicas.pdfIn PDF document text
    • https://wilasumoleliwu.weebly.com/uploads/1/3/1/4/131414134/07acc9eb.pdfIn PDF document text
    • http://bufibinokurun.scienceontheweb.net/bocconia_arborea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_6016795cf1b6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379971/normal_5fdae62718bd7.pdfIn PDF document text
    • http://lukiduxipapep.mywebcommunity.org/2019_subaru_forester_2.5i_premium_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rijemow.onlinewebshop.net/the_fallen_leaf_thai_drama_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a48a110a-7452-44df-8d92-397c48e8ff9b/eclipse_mp3_manual_fit_clip_plus.pdfIn PDF document text
    • http://palelezugob.onlinewebshop.net/xawoniwoxusurirola.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865404a9-2a3c-4823-8543-6b4809f36c33/baby_girl_dressing_gown_9-12_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d67284ab-f866-4da7-a33d-217e4f976050/kirkland_spiral_sliced_hickory_smoked_ham_instructions.pdfIn PDF document text
    • http://nisetekotixob.myartsonline.com/45972007292.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_off00010999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10999 5928 bytes
SHA-256: e3cc576bacb997b05e2c5635e2da999afa7310044c01cfee770a06c0fb6b97cc
font_01_sfnt_off00011d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9B 12104 bytes
SHA-256: 22af1b5a4c26be516a702a2b188b8ed2fa1e729938f12f769d20cb5ab52c118b

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