Malicious PDF — malware analysis report

Static analysis result for SHA-256 91540dbbc93995bd…

MALICIOUS

PDF

78.2 KB Created: 2021-04-24 00:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91fe0b8372f0d8c3f58df41eafc5fed7 SHA-1: c1c5a03ffc41dc41d4f2a0bba0ecc611329ffa99 SHA-256: 91540dbbc93995bd7cd3145d2393114d9df44d76a753004c9b13e432b9658003
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with the ML classification, points towards a malicious PDF designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=satrapi+persepolis+pdf
    • http://autobuff.xyz/simple_ping_pong_game_javascriptby8cl.pdf
    • http://durowan.sportsontheweb.net/bumilinovasug.pdf
    • http://spencermcman.us/tutu_app_2019_ios0etm5.pdf
    • http://kakorezikudu.mypressonline.com/fasepojepumariwa.pdf
    • https://tirusagoxavux.weebly.com/uploads/1/3/5/3/135329940/318cfa8d05c6a.pdf
    • http://clebohets.xyz/vipevasakitoamk.pdf
    • http://hookup154.fun/rinazadamhbmmd.pdf
    • https://reguxisafado.weebly.com/uploads/1/3/4/2/134265580/wirowaj_rotuwunaperoz.pdf
    • http://vas-rem.ru/jumpstart_mtg_release_date_arenap1joy.pdf
    • https://zizonilorixu.weebly.com/uploads/1/3/4/7/134772478/2683603.pdf
    • https://wamabiror.weebly.com/uploads/1/3/1/1/131163705/suwepapatiz.pdf
    • http://bellissimo.online/disney_paint_by_numbers_free_onlinecc7gp.pdf
    • http://hook-up.fun/7271408311368iil.pdf
    • http://xijipeva.mypressonline.com/jaxubuzebe.pdf
    • http://natur-green.fun/65039924187eb1xh.pdf
    • http://dkmz1.club/an_inspector_calls_context_gcse_bitesizejvlbo.pdf
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/lowifetebegenatoduz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zivexotafoni.myartsonline.com/gazetted_officer_certificate_for_aadhar_card.pdf
    • https://c6111751-42b6-464f-a8b1-832d492ff999.filesusr.com/ugd/3d0627_467f596384da4a4cb4abe1fbac5772e8.pdf?index=true
    • https://s3.amazonaws.com/wanalovum/83256574763.pdf
    • https://s3.amazonaws.com/gurafoga/amazon_fire_hd_10_2019_manual.pdf
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_cecea72cbbf0471aa6dc476e0db13b0d.pdf?index=true
    • http://zegiwewezenaro.myartsonline.com/dikitewolaletomora.pdf
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_4d8dd966dd9b4d5b8bb32643933a85f1.pdf?index=true
    • https://s3.amazonaws.com/padosumifubobo/siwevubumeji.pdf
    • https://86908e24-11f3-43a1-9346-bf531f45ee0b.filesusr.com/ugd/97493d_2aa6791a589540b992c0e299a491db62.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee0e.bin
5b996afe6152fc012e302a5402689c3a98378f4c9e15ee81670e0d51d2c08726		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 5136 bytes
font_01_sfnt_off0000ff91.bin
209d8b5d1b1394e87edada5c93cdef2f58569b9af6c703766abe97685a2a5ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 13844 bytes

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