Malicious PDF — malware analysis report

Static analysis result for SHA-256 827d22744bf66ab9…

MALICIOUS

PDF

67.1 KB Created: 2020-11-18 17:18:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2eab8162251379bb2f01d91821de7346 SHA-1: d0ad138b38bdeeba490937bff7e4b5187ebc59fd SHA-256: 827d22744bf66ab9d542c0e18106d7dcb12e2c6467f75be54310ecec8c5c67a3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or SEO spamming operation. One of the embedded URLs, 'https://trafffe.ru/strik?utm_term=let%2527s+get+married+jagged+edge', is particularly suspicious and likely serves as a redirect to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffe.ru/strik?utm_term=let%2527s+get+married+jagged+edge PDF link annotation
    • https://vunatoja.weebly.com/uploads/1/3/0/7/130738644/surumofib.pdfIn PDF document text
    • https://nikotegonekis.weebly.com/uploads/1/3/4/6/134628666/gejanaxipofimufo.pdfIn PDF document text
    • https://vuxidozeni.weebly.com/uploads/1/3/4/6/134669409/a18dde1b0f341c.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/6981840.pdfIn PDF document text
    • https://motanaweda.weebly.com/uploads/1/3/4/3/134316912/satowolit_pixogojegexokig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423714/normal_5f9c4facebc66.pdfIn PDF document text
    • https://vozexipazaxa.weebly.com/uploads/1/3/4/4/134444785/fuvaruj_gajigutatexe_vugekitizas.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://s3.amazonaws.com/jeromopelurab/tamil_dubbed_animal_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/19575305201.pdfIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/vinowaded.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/williams_manual_of_hematology_9th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/jozetej/sales_cloud_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/1147919982.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 4736 bytes
SHA-256: 97f9f0b1bb74aed8f765ab4e02ae8d4845a72a18bb0661f0cf3cfd63d72ae9d8
font_01_sfnt_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 11172 bytes
SHA-256: 07e13dce2a2de6b96a8df34a6c38c55e25048f8ebb4168166be137ddbe017daa
font_02_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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