Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc935ef70b3adc3…

MALICIOUS

PDF

74.5 KB Created: 2021-04-08 10:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4a645ea1ab0c0be9ddd74c53c57b1ca8 SHA-1: 7c6562ff9d5152402a4faf48ee333c47f7bbe186 SHA-256: 4bc935ef70b3adc33524ab25bd282a8611c2d6239adbacfb78a629b380db7ad5
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/strik, is likely used to redirect users to malicious content or further phishing pages.

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://mezovuduw.ru/strik?utm_term=how+to+engage+glutes+before+workout PDF link annotation
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/6571056.pdfIn PDF document text
    • http://1xbet-football.fun/9081819434x5r10.pdfIn PDF document text
    • https://tekemuwuva.weebly.com/uploads/1/3/0/7/130775778/megenaw.pdfIn PDF document text
    • http://pr-bux.online/29832294975nxr8t.pdfIn PDF document text
    • http://wildber.store/49017983398f9uwg.pdfIn PDF document text
    • http://vovality.club/jobimugipizisemonis2w7xt.pdfIn PDF document text
    • https://rejukikigukaw.weebly.com/uploads/1/3/5/3/135387704/widezulejen-wipesuvozemugi-xogoxewagajol.pdfIn PDF document text
    • http://bimadepunepi.mypressonline.com/latest_biodata_format_for_marriage_free_download.pdfIn PDF document text
    • http://lipenav.mypressonline.com/waziw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_410adb2a7f2f4946bdeff7a5e303362b.pdf?index=trueIn PDF document text
    • http://fuvarijes.atwebpages.com/lufela.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_d432218af7514308a13c44a6b9007f15.pdf?index=trueIn PDF document text
    • http://biwefejiza.myartsonline.com/97221244593.pdfIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_01a88e6b11f441cb96b48a16e7938235.pdf?index=trueIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_dab212ac21a540df9fbb4b4b959cfbe7.pdf?index=trueIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_d9be07e6bc954e00bd5e543a1a471c37.pdf?index=trueIn PDF document text
    • http://zivexotafoni.myartsonline.com/lactogenesis_en_vacas.pdfIn PDF document text
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_0d2c675b0ad34633985be1d59ecd8aca.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_e61e262c6466491d9e6777ef4cf388e5.pdf?index=trueIn PDF document text
    • http://dawejur.atwebpages.com/graphic_designer_resume_samples.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_off0000e4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C9 5192 bytes
SHA-256: ecca2593a54de00f669e13e6e7ea1d76cecae3eb3b55c10199a9251e8a9f57ae
font_01_sfnt_off0000f69b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69B 10696 bytes
SHA-256: 4d838d12c98ca6e78798c92f27878310331c2a4f097b92fe9bac5a9c23399eea

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