Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f2b6a9d5ac3c19e…

MALICIOUS

PDF

74.6 KB Created: 2021-04-22 08:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 55ceb373122d5eb204b96cc9d5a3db42 SHA-1: 27ac8dae26e9c6d389407cad4130f1bc859d85a2 SHA-256: 2f2b6a9d5ac3c19e491ae22ed9df5a9514e266431654663438b8b8b94273f677
186 Risk Score

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 or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely related to phishing or malware distribution. The embedded URL and the heuristic firings strongly suggest the document's purpose is to redirect users to malicious sites.

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://pelibifir.ru/strik?utm_term=2012+toyota+camry+display+audio+system+owner%2527s+manual PDF link annotation
    • http://lalikexitaxixix.getenjoyment.net/gakazuneripelomoveze.pdfIn PDF document text
    • http://kaxiwex.iblogger.org/19033629613.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nonabafat/19485379602.pdfIn PDF document text
    • http://reditab.epizy.com/44167918318.pdfIn PDF document text
    • http://sesunofopum.epizy.com/gizevebipujufidifimok.pdfIn PDF document text
    • http://zidumive.rf.gd/fixing_sheetrock_cracks.pdfIn PDF document text
    • https://4fd47d7d-96cb-4cdc-943f-55997d715fc9.filesusr.com/ugd/ab3424_a0d62320ed8642dba713810c34b42fb3.pdf?index=trueIn PDF document text
    • https://e114ad41-1367-46fe-a5fd-427bf640f69d.filesusr.com/ugd/a63c55_9b29ebb642c94c4f93dd83033031839a.pdf?index=trueIn PDF document text
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_6f9c1f5592f941a3aad4f1c326a7ae47.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_3ecb2ca14d9f4630b82325393d343810.pdf?index=trueIn PDF document text
    • http://lugopupi.rf.gd/6443704809.pdfIn PDF document text
    • http://rirobufopebed.rf.gd/29893396142.pdfIn PDF document text
    • http://bujekotu.atwebpages.com/call_and_put_options_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/dibekofevom.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/12657810052.pdfIn PDF document text
    • https://a04ad255-06d6-4b17-97e7-91173d300295.filesusr.com/ugd/6864df_5a712b7cda2e4974b3b53fe8e8231f33.pdf?index=trueIn PDF document text
    • http://pixagikaw.epizy.com/aecc_full_form_du.pdfIn PDF document text
    • http://romofimor.onlinewebshop.net/saloxat.pdfIn PDF document text
    • http://xukaneteris.epizy.com/5210547760.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_9e67f2e38f8f4551b3a6d3cdf5e4cdae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/posaxugidut/32829539901.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5676 bytes
SHA-256: 2fb5378ba7fded8952a3da2c95e47b2ac6590cd23f2dd45f18684f3522edd1bc
font_01_sfnt_off0000f8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E0 10460 bytes
SHA-256: 027b55c1bf93f47af0536ae84df156da1942426a4cfe1ce43516759e0fab1530

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