Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc4d83b1d45da04…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 12:47:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e82f974075368c9430f417ce8cc4ae39 SHA-1: 5b40f37ef0fe7df8d645a4a2ededba92fdc12647 SHA-256: fdc4d83b1d45da044646ac5bdcd1a7b54a7044e6a2dc20b22acdfedc707cf593
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

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
  • 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.
  • 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://xezojetit.ru/wix?keyword=nuclear+decay+worksheet+%25232+answer+key PDF link annotation
    • https://zitozujenuzudip.weebly.com/uploads/1/3/4/0/134042901/ketijezadevob_vezag.pdfIn PDF document text
    • https://tebafazar.weebly.com/uploads/1/3/4/2/134265880/durubidofi-vejotafure-zivakunudur-muselubalevop.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/37siagf/pottery_art_studio.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/hjhjhgm/25873198976.pdfIn PDF document text
    • http://zixaxagewan.mypressonline.com/bossa_nova_drum_beat.pdfIn PDF document text
    • http://goladelexugezi.sportsontheweb.net/30771919276.pdfIn PDF document text
    • http://rafupofamurawaf.mygamesonline.org/26906796324.pdfIn PDF document text
    • http://xuvavarapegu.mywebcommunity.org/wikowatuxeraf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bowedujo.rf.gd/rokatoxejemukelalotugo.pdfIn PDF document text
    • http://sojoramuf.epizy.com/liwiwebepebesudodizo.pdfIn PDF document text
    • http://xamukipadu.myartsonline.com/43391701644.pdfIn PDF document text
    • https://e05bdd54-7536-4db1-b7ed-110d7b12163e.filesusr.com/ugd/dd5a80_893ec1c221c94bff91231d5d6329052c.pdf?index=trueIn PDF document text
    • https://b27aca93-056c-4dd2-83a6-fd909c9f709d.filesusr.com/ugd/2ba3ac_edfc67abdbe745adbefec7713b9309b7.pdf?index=trueIn PDF document text
    • http://ramigavatezeten.epizy.com/dezasefopuxazemiwawuwe.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_7539c6b11b4d48aab6f180e46f17a946.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_244d161f96d2420997ca5cbefa645f0b.pdf?index=trueIn PDF document text
    • http://zipulosi.atwebpages.com/botanical_illustration.pdfIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_48a027d4be8441fd84669fea6665001b.pdf?index=trueIn 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_off0000eb25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 5256 bytes
SHA-256: 70451ff2022393535363c3d28ad170a4c3523d307c58fca9487451b3b1b55cf5
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 11676 bytes
SHA-256: 6578c9f3a53762ff4c5098aa6c5f2db3f64c85030a8c3edcb2891d1d47ebc7df

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