Malicious PDF — malware analysis report

Static analysis result for SHA-256 76b0e8afe372cc8b…

MALICIOUS

PDF

70.3 KB Created: 2021-06-09 08:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b77fbebb4be0c776a725a7e4391dfc3 SHA-1: ca808be4bf50c27e4e4a31a76a43b6002e7d557d SHA-256: 76b0e8afe372cc8b636821c61fb0dd1b76992ea1615240bbebb33ca595534d32
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or phishing attempt. ClamAV also detected it as a phishing trojan. The presence of embedded URLs, particularly the one pointing to 'laborke.ru', indicates an attempt to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and URL findings strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/pbw?utm_term=make+a+slope+equation
    • https://popajilosofov.weebly.com/uploads/1/3/0/7/130776408/f4c74ad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fudejob.pbworks.com/f/charter_spectrum_reference_code_s0800.pdf
    • https://uploads.strikinglycdn.com/files/638b952d-27e8-404f-ac4c-2fbed88cdbcf/ib_biology_book_oxford.pdf
    • http://gutupum.pbworks.com/w/file/fetch/144652326/70627854895.pdf
    • https://uploads.strikinglycdn.com/files/2be640bf-0c23-45f9-bb14-29b1eb9353ed/how_to_install_rheem_retex_27_electric_tankless_water_heater.pdf
    • http://kigemulu.pbworks.com/f/life_science_grade_12_past_papers_and_memos_2019.pdf
    • http://mevuteled.pbworks.com/f/14503095274.pdf
    • https://uploads.strikinglycdn.com/files/4bd45cdc-6198-4cdf-86c5-8783fc4fcef6/does_affirm_check_your_credit.pdf
    • http://fisukafetif.pbworks.com/w/file/fetch/144424911/pandas_get_one_column_as_dataframe.pdf
    • http://rupebaxo.pbworks.com/f/bafagogafatodolagezo.pdf
    • https://uploads.strikinglycdn.com/files/f9155049-2232-4e1b-aab1-e372f021a0c5/xifimotinase.pdf
    • http://zuvumuname.pbworks.com/f/58648678875.pdf
    • http://sozakuvepar.pbworks.com/w/file/fetch/144487344/giwipulofajutemobesezop.pdf
    • https://uploads.strikinglycdn.com/files/8e7f0c56-4f09-43d6-8028-75f06468bbae/tekerapukuboviwiwotorije.pdf
    • http://gajufabeke.pbworks.com/w/file/fetch/144890814/7423672406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d760.bin
67b3c38ce348f8e7e87b48577157be90e069ecaa1fcae3997c1b27bf4e9d6ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 4912 bytes
font_01_sfnt_off0000e83d.bin
5f91dd11fbe08cec86f89b8aa251d6f904302d86a2765d6d9f4992014faf2883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 10596 bytes

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