Malicious PDF — malware analysis report

Static analysis result for SHA-256 053c0ffb66c1af74…

MALICIOUS

PDF

78.3 KB Created: 2021-04-08 05:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: b176aac4591bada075cfd08f6680cc8d SHA-1: e74c6c82e05eb2a68cb1e2e4610414affdc53649 SHA-256: 053c0ffb66c1af74f5b1bf752eee983a99388ac6216a5da42ace61d60a56ccdb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm intended to direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, possibly leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/123?utm_term=eba+report+on+asset+encumbrance+september+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387702/normal_6011e91cdaf8f.pdfIn PDF document text
    • https://boxijobanopuvob.weebly.com/uploads/1/3/0/7/130739783/feb3ad2f78471.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_600549b876f3c.pdfIn PDF document text
    • https://vobilazi.weebly.com/uploads/1/3/5/3/135300702/banababe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475565/normal_602c7922c7bd5.pdfIn PDF document text
    • https://ravodesukifalav.weebly.com/uploads/1/3/1/1/131163780/3f1c41ace7c27d.pdfIn PDF document text
    • http://fipagolanikobax.mygamesonline.org/64201890616.pdfIn PDF document text
    • http://tafuxasomup.getenjoyment.net/33233467784.pdfIn PDF document text
    • https://gudaxukusakirip.weebly.com/uploads/1/3/4/0/134096244/rafewefomawinevinipa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464070/normal_6016c593240b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://979cd01f-16ea-4d2c-b189-234964c95597.filesusr.com/ugd/d4c4cf_91f7527123564a9bb348c1cbcda164ff.pdf?index=trueIn PDF document text
    • http://mojigoka.atwebpages.com/cambridge_primary_english_activity_book_stage_2.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_9cb87a8eb42141cb9ce3df83450b9921.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_d385063c8a6f4e66af16ec0d9c69cff9.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_879be3cff1164a72a1e6a0fc7935c16c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e257675-32ce-475f-9ae6-75600851daf6/xexuguwesedolo.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/curriculum_defined.pdfIn PDF document text
    • https://f0198b83-f3fe-41b4-8315-bacd7eabb238.filesusr.com/ugd/2b3f46_049bee17c2ee49d199326a1c537e6c11.pdf?index=trueIn PDF document text
    • http://polilofu.onlinewebshop.net/11_22_63_audiobook_length.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ae8cb63-826c-4c3d-b9c4-4d2561c605e5/lutatunosuguwerumok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f428d88f-ccd4-40b1-b021-4bce9834be43/8798811670.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a25e892-0916-4334-8d70-0e38c83472b4/common_centroid_capacitor_layout.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 5496 bytes
SHA-256: 3d61e20e63f8dc1c8514148f1591e4ceb556092a6dad6e769c18f93583a197e5
font_01_sfnt_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 10984 bytes
SHA-256: 073f5b5e5907605f49b4a4514e63eeced36d665d6381450f6700db608c8f4c3b
font_02_sfnt_off00011d88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D88 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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