Malicious PDF — malware analysis report

Static analysis result for SHA-256 e539d2d5966a66a8…

MALICIOUS

PDF

78.9 KB Created: 2021-04-20 14:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: da68fd86826955bd0b81b48b1037f541 SHA-1: a4fdcfa1c0074a293ef0d125813221e042c7b670 SHA-256: e539d2d5966a66a826ac912471bf0b60ff825821a91eda680a821789749cd733
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm or SEO spam operation. The document body, though partially corrupted, contains text related to resetting a Galaxy Tab 3, likely a lure to encourage users to click the embedded malicious URLs.

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://kuzutuzo.ru/strik?utm_term=how+to+reset+a+galaxy+tab+3+to+factory+settings PDF link annotation
    • https://dukazisilibe.weebly.com/uploads/1/3/4/6/134679988/7518601.pdfIn PDF document text
    • https://zulevoto.weebly.com/uploads/1/3/2/6/132696122/3370593.pdfIn PDF document text
    • https://geguromivakof.weebly.com/uploads/1/3/4/3/134332909/7389474.pdfIn PDF document text
    • http://6gusevshop.space/59142234619wuxyb.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/05ec3aa0007ebc8.pdfIn PDF document text
    • https://semogabetik.weebly.com/uploads/1/3/1/4/131482882/ac0918a03f6.pdfIn PDF document text
    • http://kkkirrreeee.space/computer_programming_high_school_requirementsdxo5c.pdfIn PDF document text
    • http://minuette.me/kujesukadepemij26zrf.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/4000ad35a.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/jihGgdl/4099546475.pdfIn PDF document text
    • https://cdn.sqhk.co/gegefemorosu/jjoiP8W/23151763730.pdfIn PDF document text
    • http://blancop.xyz/how_to_change_oil_in_a_generac_gas_generatorzurdd.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/je6EicD/80580341633.pdfIn PDF document text
    • http://bestsaleshopin.xyz/46370273633kj6lu.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • https://fitisasituwag.weebly.com/uploads/1/3/4/8/134846324/f4248b7.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/EjjYKam/33281547664.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusuposakatoxel.myartsonline.com/ahlan_wa_sahlan_textbook_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a026fea-964d-4e55-919f-c29ea3db40c7/go_tell_it_on_the_mountain_song.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/tewokelebux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2638fef1-88e7-43e3-86f9-7272e80fe42f/dufewuf.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_off0000f523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF523 5576 bytes
SHA-256: 2ad19123a164bb89171436e2cf342cd90dcf5cf219a704218230f4d2ece3a31e
font_01_sfnt_off0001084c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084C 11036 bytes
SHA-256: d57c431dcdb3ca91a5dfb67bec9393f469d3fa36a570ad68525ecd1918358c9b

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