Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf2a44cc6f14498…

MALICIOUS

PDF

76.6 KB Created: 2021-03-19 08:11:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 985ad606923a7cc13ac98842fefe2497 SHA-1: 28d0f31b7004a1f2254bd85b6a5dd2e9819f8750 SHA-256: 0bf2a44cc6f1449887f74b0b3aee7c631a33ad83c663355503ea05a0bd292d2d
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 0.9953

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://crophysi.ru/strik?utm_term=how+to+reset+citizen+eco-drive+calibre+8700 PDF link annotation
    • https://wunurobi.weebly.com/uploads/1/3/4/8/134881210/pisobededinol.pdfIn PDF document text
    • http://goldstein.berlin/48434261438605h9.pdfIn PDF document text
    • https://jaluxuza.weebly.com/uploads/1/3/4/3/134345387/vugitekinev_nikalawer_sonazodufu.pdfIn PDF document text
    • http://parkingtest.xyz/tipijomisizot8bk1z.pdfIn PDF document text
    • http://artdebug.site/genie_excelerator_model_isd1000_manualjlf2q.pdfIn PDF document text
    • http://titoto.xyz/what_exercises_improve_strengthysc1j.pdfIn PDF document text
    • https://rixevabibevata.weebly.com/uploads/1/3/2/7/132710753/rebuzej-mivanawupuf-lezoruxeza.pdfIn PDF document text
    • https://xejuxomezul.weebly.com/uploads/1/3/1/6/131637030/vijokukapo.pdfIn PDF document text
    • http://igrarazuma.info/47748430730ylqrd.pdfIn PDF document text
    • https://sigesibum.weebly.com/uploads/1/3/1/4/131438142/42520dfb86655.pdfIn PDF document text
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/bawub.pdfIn PDF document text
    • https://gipulafu.weebly.com/uploads/1/3/4/4/134442702/galetega.pdfIn PDF document text
    • https://lenopeseku.weebly.com/uploads/1/3/4/0/134040497/vipinologafav_berukamamolumu.pdfIn PDF document text
    • https://mexubigewexuni.weebly.com/uploads/1/3/1/3/131384635/mafibusuvesotuv_fadoxu.pdfIn PDF document text
    • http://fejixisuburuza.22web.org/use_hug_in_a_sentence_for_kindergarten.pdfIn PDF document text
    • https://bumogekatagod.weebly.com/uploads/1/3/0/7/130776321/robil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ximuruguj.epizy.com/pibiwewam.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_8dfb41f41b584cf69a8a86d57cb05565.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccf8b56-9f42-4329-a8ad-e26de7359fc1/30613821390.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45229e92-b932-4420-afc5-550e0d7221b6/restaurant_operations_audit_checklist.pdfIn PDF document text
    • https://f38be386-5799-403b-9303-fb121113655a.filesusr.com/ugd/6f1aa7_635a776ad9284b0da66ae16cd14c9f1e.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_4be5331ef7c546009ffa607a0468f1b6.pdf?index=trueIn PDF document text
    • https://08c3cc13-1ce0-4add-927e-a3aed263473e.filesusr.com/ugd/ccf397_c66cead715764a44943dfb6f7a836e16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/58c9753b-02ec-4110-b0fd-764876f21e90/45913131014.pdfIn PDF document text
    • http://ribigilubawedom.rf.gd/continuum_mechanics_for_engineers_third_edition_solution_manual.pdfIn PDF document text
    • https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_4405fda88c8640748b78bdef31d2a0ff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/46c67c08-7ffc-47f3-bcaf-13f912b3b169/singer_solution_to_world_poverty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3da2957-cb5f-4a7f-b3d1-f10364a289e2/rojibevalabixeku.pdfIn PDF document text
    • http://sivutesafukim.rf.gd/noxazerolesufojazufab.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_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 5684 bytes
SHA-256: 81b928ef0cc0a621d6db392dcac7884dc15b1c985fccc6caecc86bb71263ddfb
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10532 bytes
SHA-256: 09425e3cd697fa281521c13d8c37c66aa95d846fb0c0afa10209e0b39e9b6a1d