Malicious PDF — malware analysis report

Static analysis result for SHA-256 725531ca0570cc03…

MALICIOUS

PDF

85.7 KB Created: 2021-06-02 20:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e33b8907b93418225db4873bd3b8c53c SHA-1: 65cdc6615d2a3afd78d602ec7eb95c5e9dd033dd SHA-256: 725531ca0570cc03520d5b1ca68953cb9a01cf1415897c4cd9c7117672b044f5
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a 'callback phishing phone lure' heuristic further indicates a phishing or scam attempt. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://vilenefex.ru/123?utm_term=nios+assignment+page++pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496818/normal_606b90f89d10c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_600f589d9fde5.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/givedemasevafupadir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403565/normal_5fc628e5f1f6b.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/vidimevup-fufifajepizok.pdfIn PDF document text
    • https://fuwiposodunumof.weebly.com/uploads/1/3/1/4/131438128/9663fc7.pdfIn PDF document text
    • https://sukopowe.weebly.com/uploads/1/3/4/4/134499194/nixuzusunag-veginego-dopuzakadare-gudewoketuv.pdfIn PDF document text
    • https://nolutoxut.weebly.com/uploads/1/3/4/6/134683805/molazezedobipek.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/2058902.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://jesababa.pbworks.com/w/file/fetch/144414753/satyanarayana_swamy_vratham_pooja_in_telugu_free_download.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/f/moxadaxuzudupisu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd9c9093-7532-45df-976f-84b2c7f15b50/selomajodovoroxip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c86b3d37-f40f-4a9c-9fc0-e9fb3371f82f/how_to_fix_tablet_charger_port.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b430c91d-5b40-42a3-bbbd-8141f820d664/65780894271.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8e6d047-79d9-4f5e-a633-1aec54a831f2/94007016241.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10F 5200 bytes
SHA-256: 78b0494c9e9bb64ced438e56f89cf17a948f48c79a6d3c05f211853208fe9bf6
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 11396 bytes
SHA-256: ad7c5c667b19a0b6db7a913d11fea6124990b1f9910e28c0c86699809a1e1f22
font_03_sfnt_off00013547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13547 5156 bytes
SHA-256: a05aa6c2c76b43e1f7feb7ad26e04c179a536ca027bf25e34efcbad1f0857a66

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