Malicious PDF — malware analysis report

Static analysis result for SHA-256 2487c44c45d2cc55…

MALICIOUS

PDF

72.8 KB Created: 2021-03-22 00:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 46bfe05c638cf0758c8c0d3890ec2e36 SHA-1: 1925cbaea19971d197f0f68744147bb1d02350e7 SHA-256: 2487c44c45d2cc5538df83e6e6339b3fe6ff49a41e1e7fdb34fab70e35300343
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=html+template+tag+jquery PDF link annotation
    • http://bumululoru.mywebcommunity.org/navodaya_admission_form_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482636/normal_601f6574cddbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419425/normal_60492af878ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465685/normal_6018b3208c620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475847/normal_5feb012a36082.pdfIn PDF document text
    • http://dexaputanit.mygamesonline.org/hanau_articulator_manual.pdfIn PDF document text
    • http://tedalaz.66ghz.com/48_45_simplest_form.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375909/normal_603d4976d3253.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501770/normal_5fcb0f71f236b.pdfIn PDF document text
    • http://kanabuwebu.22web.org/yayati_marathi_book_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_605190218eca4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423427/normal_5fc63ca7d829b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492245/normal_6043db51da496.pdfIn PDF document text
    • http://vetobiz.sportsontheweb.net/68754896971.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://limixumijegaf.epizy.com/biology_review_booklet_answer_key.pdfIn PDF document text
    • https://1138278f-e8d0-45ef-aef3-dbdd7428ac52.filesusr.com/ugd/5be868_7585b51be5464f78a7c08a930a03d550.pdf?index=trueIn PDF document text
    • https://5090c2af-253d-40c3-bfb7-942fc6db26b0.filesusr.com/ugd/0511f5_c482a9c72dca4cb988b1903307e15e53.pdf?index=trueIn PDF document text
    • https://adc67df4-9ac4-4169-8225-f8d60376216a.filesusr.com/ugd/a1c2c7_0b4bc0f3fa9e4d9c86605099ff0ebbed.pdf?index=trueIn PDF document text
    • http://mitofozajibo.rf.gd/voxejubimofugusamax.pdfIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_3977fb5694324d3e83d748ed8b895f1a.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_off0000dd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD40 5224 bytes
SHA-256: 4dce2a94c967f83416e2af30941c1e2281e99c188c7974a2be952797d7ebba0f
font_01_sfnt_off0000eefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFC 11360 bytes
SHA-256: e8850e7e9d85b920237d9d8f7744a1873e34129258491c547e60ef9b15080671

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