Malicious PDF — malware analysis report

Static analysis result for SHA-256 754f003ec1ef6596…

MALICIOUS

PDF

81.3 KB Created: 2021-03-10 16:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 7bf719fa17985557b8442a871ca42c15 SHA-1: 916c3c8af40968854a43bd08de5d2c6e6a3e16cc SHA-256: 754f003ec1ef65966d0849be57b9940ded64723d1384732b4d6958e1ca8ee572
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically pointing to a suspicious domain ('leonvi.ru') that is likely used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further suggesting malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score strongly suggest this PDF is malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/award?keyword=mantenimiento+de+aerogeneradores+eolicos+pdf PDF link annotation
    • https://cdn.sqhk.co/nasubivapu/ibDicWb/hard_time_prison_sim_mod_apk_1._410.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/2f4Mid9/fijutuvemazeka.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/qgfjfhb/muremotiwubuloburetez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_60134b812860e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477863/normal_5ffcb2f05ac43.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474206/normal_5fe5aa660bbfc.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/hinhdic/varutusixuve.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/can_my_baby_camera_be_hacked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6044d5fdb4144.pdfIn PDF document text
    • http://kejoxemubogese.mywebcommunity.org/toyota_corolla_2016_price_south_africa.pdfIn PDF document text
    • http://blue-tick-central.com/36943914730hy80a.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/hgDhenu/onedrive_for_business_sync_client_latest_version.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447641/normal_5fd61402aa62e.pdfIn PDF document text
    • http://wwwbcpzonasegura-viabcp.com/22666142047jwu5d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5a1af34-6a96-498c-8c52-51394b73c785/10112518523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e9859c2-86ff-4092-a3f7-53644c0f3895/thetford_rv_toilet_ball_seal_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f881eafe-073f-4419-948c-58a0194b9cdf/23429592987.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f3fc42-70f3-4260-b3f1-1d7f7b1f7abf/short_stories_for.kids_in_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a3a1700-0a83-46ec-95d8-aacd76fb6115/tim_farriss_inxs_net_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88467596-e75f-4410-b998-b89c0af21e50/magimoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b95c53fe-4fa7-41bd-8530-f65126f44878/mandarin_pinyin_chart.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_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 5480 bytes
SHA-256: f1f9edf999b4ab0de11d652bd055644c20962609aadaf29d2a99d49265ebfe67
font_01_sfnt_off00011074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11074 12212 bytes
SHA-256: 7fea1969ef74c72c05773adba08f663321f47a0ae0eafbea73813703143a7061