Malicious PDF — malware analysis report

Static analysis result for SHA-256 633229454230eabc…

MALICIOUS

PDF

76.5 KB Created: 2021-03-30 02:11:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d330dd34793debb21018e49c975d4b8b SHA-1: c40badb01b218952898457e446fbcb24b96d554a SHA-256: 633229454230eabc9e93b155a46d8000918ebf7b90814cf3d928c5426ca49f29
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://leonvi.ru/123?utm_term=customs+declaration+form+into+mexico PDF link annotation
    • http://bluebadgeapproval.com/balance_sheet_sample_ifrsgm9f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452372/normal_5fd2c826c2856.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fe05c5e3054a.pdfIn PDF document text
    • http://mrshadow.net/lakaklvqdr.pdfIn PDF document text
    • http://yachts-4-sale.com/what_to_do_when_your_laptop_monitor_wont_turn_on7u7t2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fdbe07ed5742.pdfIn PDF document text
    • http://forecast.bet/6498767781e80ta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_722ec4d194ee4d9ebe3493244e32def1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/saluxerijuxo.pdfIn PDF document text
    • https://d525ee04-2a40-494f-8ba9-fee52f7b18ee.filesusr.com/ugd/8b8e24_795c9d78efb2420fa7e7a5bba2dac05d.pdf?index=trueIn PDF document text
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_508169757e20475e8d8cbe37742d0d0c.pdf?index=trueIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_19179c2f3f4a450a96c370f77ee8e084.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gupojakami/kirimofonezonow.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_5d54355ea6b643639d70bc28e0d1008d.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_0d475b21e97f4f18975fb780cf9e2502.pdf?index=trueIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_c58af23b4d674b8abd3691e32160f228.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49a49f3-c586-4198-9273-d475ee25e9d7/craftsman_14_inch_electric_chainsaw_blade.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/facebook_templates_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/los_5_lenguajes_del_amor_libro_descargar.pdfIn PDF document text
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_2fa7bd05fcb94502b359ea12aa1ff441.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d71885b6-fa46-45cc-b1b4-fe353239c0c2/spirit_blossom_thresh_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/global_gender_gap_report_2016.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_eb96b064235d457c9f92c0fad2343d2c.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_off0000eb31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB31 5140 bytes
SHA-256: 75bc5e6699e603bfe707f5aed82627f2717f9a832c71f44263ae496f6f8b18aa
font_01_sfnt_off0000fc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 11892 bytes
SHA-256: b06d77747a992ad50eeb7afc99b543406cb68cffdf2a2a30beb9648e1e14f02a

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