Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e23c48956bd9c19…

MALICIOUS

PDF

103.0 KB Created: 2021-03-05 07:31:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 9b6c59da18f07f1f1e004ea9f2e7ef51 SHA-1: 72642f1b0d03d92c1995e1bf86ab4b01040a3c65 SHA-256: 7e23c48956bd9c19438e148641e2f2e483e5d926de0ae4bb8d226b12f4f1541f
66 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a large number of links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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/strik?utm_term=what+are+the+8+stages+of+erikson%2527s+theory PDF link annotation
    • http://opensucre.pro/dajenodegisi3rr1a.pdfIn PDF document text
    • http://topcabinets.xyz/10_day_juice_cleanse_results3ppxr.pdfIn PDF document text
    • https://xijoxipuxob.weebly.com/uploads/1/3/4/7/134704834/dcbbe.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/venilopituva_regigikexasofo_tudorigive.pdfIn PDF document text
    • https://solatozelejas.weebly.com/uploads/1/3/4/7/134714892/4857580.pdfIn PDF document text
    • https://gigawixirebasig.weebly.com/uploads/1/3/1/8/131857482/3644840.pdfIn PDF document text
    • http://forecast.bet/zerufakesilatebomazalekdvuz.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/reasons_why_a_dryer_will_not_heat.pdfIn PDF document text
    • http://wgathering.org/27052187984oypup.pdfIn PDF document text
    • http://tk-pobeda.site/96708578432pd4fk.pdfIn PDF document text
    • http://idealica-ordina.site/merchant_of_venice_workbook_answers_act_3_scene_2_icse_hubt05vv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rejiner/79968723160.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2205ef47-b762-42e3-828a-07e3d263dd2b/5_8_pulgadas_cuantos_cm_son.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c30ca50-9227-4236-b1cd-aa07d1f908bb/kapediwivugerefakimepemo.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/adobe_premiere_pro_cs6_free_trial.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/finozit.pdfIn PDF document text
    • https://s3.amazonaws.com/jazuravazaguz/condition_inspection_report_residential_tenancy_bc.pdfIn PDF document text
    • https://s3.amazonaws.com/bejideba/toyota_avensis_manual_transmission_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/938b94d8-0bd1-4ea0-8773-577a2a0acb5a/guitar_songs_free.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/what_is_the_frayer_vocabulary_model.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_off00015662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15662 5404 bytes
SHA-256: 04cf08a2bf64375a2a9570768d09c3c8a68f1037cf637ea28234911c6b8b4fb4
font_01_sfnt_off000168db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168DB 11252 bytes
SHA-256: b8cdd3b2d5fb8071861f92697242feaf61a58f8dfada12d1a391c01d8c264188

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