Malicious PDF — malware analysis report

Static analysis result for SHA-256 421a727b21cbd847…

MALICIOUS

PDF

74.5 KB Created: 2021-06-10 20:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f079801ee8c608bd051bb7a10b421568 SHA-1: a84484fc5a84e5dd622da11b57e1447244084fa5 SHA-256: 421a727b21cbd84756c5a75de55dc3b17802d9d25bee918b72f31eb895283041
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The primary malicious URL identified is https://laborke.ru/pbw?utm_term=all+the+time+tables+up+to+100.

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://laborke.ru/pbw?utm_term=all+the+time+tables+up+to+100 PDF link annotation
    • https://relakurofur.weebly.com/uploads/1/3/4/8/134872141/xavaziwurepiw_ponobebudid_xesodotasuzis.pdfIn PDF document text
    • https://dujewukemapaf.weebly.com/uploads/1/3/1/4/131453220/ad86459e9909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kedetuwi.pbworks.com/w/file/fetch/144569334/gatavosenixadodadim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5d76b2f-e63f-46d1-93dd-eac641582a96/96518134308.pdfIn PDF document text
    • http://nafidob.pbworks.com/f/xefilizul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/372f57a0-8985-4309-b32e-0c224132f294/62834857278.pdfIn PDF document text
    • http://foziwedugumu.pbworks.com/f/93030755022.pdfIn PDF document text
    • http://vamafob.pbworks.com/w/file/fetch/144827448/82114640978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b43b635-6631-4846-a13e-089c7e06dd05/nivumidowufo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b1a20d-61c7-4420-9807-fb599c5c4477/gurusomuzixaxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7ccf3aa-2592-4563-b551-7c818ce64022/mezebolefuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f41a3ad7-5480-49f0-89d6-cee07fe69fdc/raxadawemak.pdfIn PDF document text
    • http://numefen.pbworks.com/f/35164017867.pdfIn PDF document text
    • http://mawasuwov.pbworks.com/f/lexol.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/f/36049075581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d470aed-7be9-4380-b139-e0c02b0966d7/what_do_the_cycles_mean_on_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee6ffa8-3538-41da-b36b-89d4f4bce2e5/how_to_send_photos_from_gallery_to_facebook.pdfIn PDF document text
    • http://legesir.pbworks.com/f/nojegiziriridakoxewag.pdfIn PDF document text
    • http://funasazixi.pbworks.com/f/naked_forex_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b802b6a5-e20e-4770-bb65-df7421ca37b3/machine_learning_python_package.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_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 5284 bytes
SHA-256: 47dc944eb0f52f4a9954e5f415497279c8ded5e2984dad11a58b44950a7a4edb
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 10576 bytes
SHA-256: bf7b89ed14d4e84e88dcebf6c1641090943494bc8e5d5b5f95fdd1637da04ef7

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