Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cfba15f1356d11c…

MALICIOUS

PDF

74.1 KB Created: 2021-04-23 20:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 989f401d4edb0ea8c4724d8be7f68a03 SHA-1: 097bf86928cc9672471e0952e47b4bd96cc6b426 SHA-256: 9cfba15f1356d11cf46eb20eb982691eb79e277f45bd0de889b77c862d972fcf
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 domains, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings related to link farms point towards an attempt to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=common+core+standards+ela+grade+4+lesson+plans PDF link annotation
    • http://vnds-super.space/658801759422fn5p.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/zifefofaloke.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/big_bus_budapest_map.pdfIn PDF document text
    • https://puguguduzi.weebly.com/uploads/1/3/0/7/130739618/07e6339e0100d.pdfIn PDF document text
    • http://duzixofiwisegi.mygamesonline.org/ib_hl_biology_book.pdfIn PDF document text
    • http://tryadasert.online/sumubus4pmvm.pdfIn PDF document text
    • https://wodorolijuzawex.weebly.com/uploads/1/3/4/7/134770742/tidozuzot_giduz.pdfIn PDF document text
    • http://dejafonuzu.iblogger.org/zanetali.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/tujut-redunukemusaxi-xosuweled-logerudulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f608bf75-187c-4b28-9621-af925c05c2b6.filesusr.com/ugd/05e3ad_73d29de379324a47b1b39db65a5ee7e7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b181086-e21e-4acf-a0c9-18f59727b95f/corporate_social_responsibility_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a77ee0e-09ab-4651-9e90-77e5e68df334/bagixaburisawupo.pdfIn PDF document text
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_4d8df992ba364c49bdd3a75837f6e3e7.pdf?index=trueIn PDF document text
    • https://84d51d8d-5932-465a-b044-5d36dace581c.filesusr.com/ugd/98e2de_cb8e3429584941b0a06de9cc63be6e85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/975c3c53-6e33-4d4e-8ba2-fa79869f82d5/26330620831.pdfIn PDF document text
    • http://livufibutimogil.rf.gd/98510753593.pdfIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_58cf103e68114680b371a4188758eda3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 5384 bytes
SHA-256: e75333d41e62e5ec303327280e658f1079cf735992a70c3ab51b81123ddb6671
font_01_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10376 bytes
SHA-256: a8fa709f59f933d2fafb67f20f3b57a5bea5cf67dd4feb2f12ccd4c294c3dbe9

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