Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5beca642e0cc0c5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-18 15:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d5a06f2c4084af582c773ba5a5a6d3ec SHA-1: 696f362a90c7c1a1e96a48dc54e02f46ca4008a5 SHA-256: c5beca642e0cc0c592dd23607af19b5aeff054fe743d4b2623d3037dc4da4e2c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used for malicious purposes, likely to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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 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://scalper.ir/data/files/file/webafubolazowotepafaj.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mumizewufebeg.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/82725748520.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/vimefabawusaf.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/80452355896.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/bexoburojeg.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/2379778151.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210913151023_904052659.pdfIn PDF document text
    • http://yuli-china.ru/d/files/denetepokumatiwe.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/zusivijokepapupev.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/37939866081.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/31064464232.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/34684138726.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/lexofidivipuri.pdfIn PDF document text
    • http://idcla.net/upload/files/xojolifevedelimoj.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/jovupofitagawisikusojizu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ad57015e---xaruv.pdfIn PDF document text
    • http://coffee33.ru/archive/file/76857881489.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/65232345613.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/dokavoj.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/22386796116.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613099588b341---fobalezarijupakumonotet.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/gefilinadiruvevevedol.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/66415403446.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/surilesekawawenumatuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+copy+and+paste+in+android+phonePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 10756 bytes
SHA-256: 12aa74e4dc3ca80064fd82b5465644840c62f13791cd0f8085495e48943b611f
font_02_sfnt_off00011988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11988 17656 bytes
SHA-256: 03579cea03548d3cb038a224a1adb9aa71123012d1a542fec3a806007b31a44c