Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd57a4778d67fd47…

MALICIOUS

PDF

76.0 KB Created: 2021-04-06 23:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: f67bbcd84edefff3f9eed9b566fd7464 SHA-1: 3b1b926e648eda20c010da287e8ae645f4a903df SHA-256: fd57a4778d67fd474ed85043811ae2f4aee322f872e29b3ec737c8f1bd28282d
126 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags the sample as a link farm on disposable hosting, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/123?utm_term=limits+of+transcendental+functions+worksheet PDF link annotation
    • https://munejubulogulep.weebly.com/uploads/1/3/4/2/134266186/bc38b30ccce3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378153/normal_6002e4fec5690.pdfIn PDF document text
    • https://dezuvatag.weebly.com/uploads/1/3/4/6/134667454/183a81d4f2c2.pdfIn PDF document text
    • http://zikewexer.scienceontheweb.net/botetupab.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/athlean_x_max_shred_program.pdfIn PDF document text
    • http://tamogulaganero.scienceontheweb.net/53792727074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460686/normal_600447f0a58d5.pdfIn PDF document text
    • http://zuwazekanusur.mypressonline.com/wizuxedikirififopabo.pdfIn PDF document text
    • http://fonivoguko.medianewsonline.com/14337012653.pdfIn PDF document text
    • http://jeruwit.mygamesonline.org/digital_electronics_books_free_download.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/nuzazozazokoj.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/f78d8868-acdb-45f3-a3d5-4a12e67c0d4c/finakofigugogifuvekev.pdfIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_224175481f254dda8949a4d6934f90b0.pdf?index=trueIn PDF document text
    • http://sijadogif.atwebpages.com/alternaria_fungi.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_e75426e99f864a0bae9ab14476afdc63.pdf?index=trueIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_2d18d9098ee2486d930e0d22c94ca10b.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_4363450ae426434cb8169bb06acaca6c.pdf?index=trueIn PDF document text
    • http://bitujiduruv.myartsonline.com/27668606260.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/gumefufuzamazidojiruzonut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bec4e0f-41b5-4520-9d8e-e93b11547183/ion_turntable_usb_cable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/487ef555-e838-4a88-b330-9b775ef509f0/52303037313.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc629d5-2457-47df-8107-ea646421d97f/75808508937.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_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 5356 bytes
SHA-256: 2ead924c666214ff025910f4eabc02a3b2d0bb350555cac62b56920c99e09262
font_01_sfnt_off0000fcb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 11024 bytes
SHA-256: ab28a75c28c7f90686521ae5113d61cc40bfa88fb092fcab076d1fe3dd519419

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