Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6eb85d5fde9896…

MALICIOUS

PDF

69.5 KB Created: 2021-03-17 23:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c2ef73ace3297b3bb48e6df3c32b5ead SHA-1: e3fab898de74456f59cde5021d267536199cbc0c SHA-256: be6eb85d5fde98965377879141e7406441c035a740e09e717d628b575f4dfcb2
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, a common tactic for link farms used in phishing or to distribute further malware. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

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://baarspo.ru/wix?keyword=fashion+fair+lipstick+magenta+mist PDF link annotation
    • https://cdn.sqhk.co/vigeroti/jjbeBib/480833127.pdfIn PDF document text
    • https://mikixobitesa.weebly.com/uploads/1/3/0/7/130776626/kofitufuxeso-volefakam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_600fb62bd5cfe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493610/normal_6000506244c8c.pdfIn PDF document text
    • https://cdn.sqhk.co/kofuvufexo/agehjQo/starting_over_chris_stapleton_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwadezab/dhg9icr/dokdo_cleanser_cosdna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374521/normal_601100b4233a4.pdfIn PDF document text
    • https://mixutuxo.weebly.com/uploads/1/3/4/6/134692071/mojafav.pdfIn PDF document text
    • https://cdn.sqhk.co/gupimupiset/3ji8xmT/amazon_prime_video_apple_tv_airplay.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/ilUhjaB/94217519544.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/c4ibBje/fidusibisesunokizidutixo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_5fd178667eec7.pdfIn PDF document text
    • https://dazenesulamese.weebly.com/uploads/1/3/1/1/131164173/sofesilejevol-savodixag.pdfIn PDF document text
    • http://welitizenowem.mywebcommunity.org/abstract_algebra_an_introduction_3rd_edition_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/rotusorukazi/MDmIkhg/fajonaveferedefekofe.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/beveiliging_cao.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lusabifef/video_editing_software_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/welanisowari/fujijevuruputakabikure.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/scert_up_ntse_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/soduralawawapizor.pdfIn PDF document text
    • https://s3.amazonaws.com/zedilegol/chm_reader_windows_7_free.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_off0000cfc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC9 5448 bytes
SHA-256: 1b336bf7c6ea6b0372050231cba30f7fe5096d0270d6cef73a5e92529a2447af
font_01_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 10816 bytes
SHA-256: a6accc49696e902d4b073b38fae7d54e2474738ecc9ee2150a30d0901fc979fb

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