Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c55801d25f5e0e9…

MALICIOUS

PDF

78.5 KB Created: 2021-02-05 23:46:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 102a4e68677040d26f5ff72590163e5b SHA-1: e2e9f0556c7db20c4d71cadc2d0b05f20aad938a SHA-256: 4c55801d25f5e0e9725bf6ed26ad9d90d42bbd35756159632a888004c50e94de
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wb?keyword=sedation%20in%20icu%20guidelines%202017 In PDF document text
    • https://venolebibu.weebly.com/uploads/1/3/5/3/135348563/bugepobex.pdfIn PDF document text
    • http://luchdobro.site/memunulalotogufozijikc8tcp.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/popokof-xupetolin.pdfIn PDF document text
    • https://dikijezirepa.weebly.com/uploads/1/3/2/8/132815872/fosufelawe_migefomiradekit_zelivuguzip.pdfIn PDF document text
    • https://soxexovefulobi.weebly.com/uploads/1/3/1/4/131484328/9671056.pdfIn PDF document text
    • https://beripoxepi.weebly.com/uploads/1/3/5/3/135325525/wirob.pdfIn PDF document text
    • http://emirofficialzm.com/tridef_smartcam_keyd05fq.pdfIn PDF document text
    • https://mupasifuv.weebly.com/uploads/1/3/2/6/132680827/befuzuwan-gizukilene-gufafuxom-wapokalumowu.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/platform_bed_queen_white_wood.pdfIn PDF document text
    • https://monijakuxit.weebly.com/uploads/1/3/4/3/134362478/fitulinobuxawi.pdfIn PDF document text
    • https://pubodepilup.weebly.com/uploads/1/3/1/4/131406337/tupojadudigojusija.pdfIn PDF document text
    • http://reactivaperu-2020.com/zemava1av0d.pdfIn PDF document text
    • http://creditpm.com/23453555488fmj3l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pogebikaku.epizy.com/auto_tune_free_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/usb_boot_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vebogotexaf/calculator_free_for_windows_8._1.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/86229419823.pdfIn PDF document text
    • http://vowafipefazasex.epizy.com/descargar_bubble_bobble_para_android_gratis.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_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 5520 bytes
SHA-256: b80b8b322d76cb858b414714482953b380b4da9aacb6dc635569334ed91edb45
font_01_sfnt_off00010839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10839 10784 bytes
SHA-256: 84d9baf07536bba00cf2cb9945b9811b592217e5073190c706e3cc32a047b2d5

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