Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d515ef58ca00d87…

MALICIOUS

PDF

78.2 KB Created: 2021-04-24 01:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3c038d908834494a8a5e7a71b617f54b SHA-1: 0e5ba76c0ecd7c192af71ab748f2dda498866dfb SHA-256: 3d515ef58ca00d87773bd0ee5154f7f050ae6951c7b49c48e8993deadfcf809a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://pelibifir.ru/strik?utm_term=do+white+teeth+look+straighter, is likely part of the malicious infrastructure. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pelibifir.ru/strik?utm_term=do+white+teeth+look+straighter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471690/normal_603e6a596a634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448542/normal_5fc858771cf07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_5fd787bbd97fa.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/xibjiN6/rutunifekugasabew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424029/normal_60417ef50982a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_6046b9d4aa850.pdfIn PDF document text
    • https://cdn.sqhk.co/mojekuvugise/Vojdhid/nupavebe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471706/normal_60004d6a09951.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454550/normal_5ff15b25d67a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408853/normal_60214f9ccdb0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470526/normal_5ffa385feefdd.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/ljhfhaU/infected_toedlicher_virus_2018_imdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_60359ab8b7c33.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/njehe6K/channel_one_tv_guide_melbourne.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_605dcb456c298.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/if2giid/rokegefuvawutimabip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408180/normal_602445b6daa48.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://3dbd840c-7861-42b4-b064-af52d1d2f4eb.filesusr.com/ugd/86319b_d39701d1c2fb4973abd0d2872ed62af1.pdf?index=trueIn PDF document text
    • https://52a1af19-6946-4c37-aba6-ab00a30e4874.filesusr.com/ugd/5dc3ca_0668c201012b4acbac219634b1deae60.pdf?index=trueIn PDF document text
    • https://78151a86-a557-4e49-81aa-a2539eea45c7.filesusr.com/ugd/204f4f_f63c4bc5ed874e0ab1dd143a47dde6fa.pdf?index=trueIn PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_a398282878b348b6abb60bed024aef9e.pdf?index=trueIn PDF document text
    • https://cc4f1b1a-08c7-467e-bb5a-e3073ad8caf1.filesusr.com/ugd/ffc175_0cb1b0e2ac3e40dab012e99766090fed.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_dd6d2c58abf04abd8bbc38d17692629d.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F9 4784 bytes
SHA-256: 7b4abe141d30a2aa51aed952c7e106878145fe83f931a949be63ffb71bb2b5a2
font_01_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 10724 bytes
SHA-256: 2c541a6bc7ed22331376e68875d5608ab105e09fb73e02c92e1139a108185668
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.