Malicious PDF — malware analysis report

Static analysis result for SHA-256 223427a79abfd692…

MALICIOUS

PDF

75.7 KB Created: 2021-06-01 14:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: cf5da07d24fb859a2fe18f5de0a4a22c SHA-1: 15116a188a3509bebfb4afafa17677c47f9f709d SHA-256: 223427a79abfd692377d1f6d86d09a2b7262a3cc5ee863127625c3f7c7f57628
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://drafthe.ru/pbw?utm_term=exercices+participe+pass%25C3%25A9+avec+avoir+pdf PDF link annotation
    • https://gozanesudobewer.weebly.com/uploads/1/3/4/8/134852120/zulidedipufo.pdfIn PDF document text
    • https://vuxojamobepu.weebly.com/uploads/1/3/4/3/134333522/zuberibewagam.pdfIn PDF document text
    • https://rurujopolobadez.weebly.com/uploads/1/3/4/4/134444805/d00164ad27f8f.pdfIn PDF document text
    • https://kogemopisita.weebly.com/uploads/1/3/0/7/130776015/8b77a8858f13d25.pdfIn PDF document text
    • https://tinuxapesizagi.weebly.com/uploads/1/3/4/4/134440362/2618308.pdfIn PDF document text
    • https://lafetewefovizav.weebly.com/uploads/1/3/4/3/134385578/860853.pdfIn PDF document text
    • https://xasewaverafi.weebly.com/uploads/1/3/4/8/134868265/mesujeli_gebalade_bipag_mamedi.pdfIn PDF document text
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/6915313.pdfIn PDF document text
    • https://womutiliwefol.weebly.com/uploads/1/3/5/9/135964171/e35e7e.pdfIn PDF document text
    • https://demifezi.weebly.com/uploads/1/3/1/3/131379940/woxujekusapiz.pdfIn PDF document text
    • https://fuzewejobedogu.weebly.com/uploads/1/3/1/4/131482867/ripinu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a35ab523-0ad6-43f1-bb76-52c2ec1f1f87/how_to_operate_delonghi_heater.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/xeguko.pdfIn PDF document text
    • http://funuvutidip.pbworks.com/f/zuwofotuxubu.pdfIn PDF document text
    • http://povelin.pbworks.com/w/file/fetch/144422994/56787617088.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/the_secret_life_of_walter_mitty_streaming_vost.pdfIn PDF document text
    • http://xosufixemuf.pbworks.com/f/why_is_the_blue_light_flashing_on_my_dyson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46ec645d-5818-4ffd-bee5-0355938f4785/sexedugotimenanexefakew.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/sejerewamobemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc8f695-7986-4c56-a3b4-ce4f9a7e506f/is_electricity_cheaper_at_night.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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 5344 bytes
SHA-256: f544a571c63eeba51f4fc8579d5e6e37af39693df8fe791e6dad448fd4afecfc
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 12280 bytes
SHA-256: 431f310aa3a825027c661dbd32d4f3b059c2215e602942215fa59b646f372c2f

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