Malicious PDF — malware analysis report

Static analysis result for SHA-256 af07215974677661…

MALICIOUS

PDF

69.6 KB Created: 2021-09-25 15:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e50e6af717b531100cba0f7be9a1dd59 SHA-1: 22cc1824db0c77f6ccd3e9c83598245c080ca084 SHA-256: af07215974677661e378936dd708c253a8defadd24298764e323ab0cfe6083ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous disposable URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of this document being used to distribute further malware or phishing content. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lemma-studio.pl/userfiles/file/kobakegelilimopubimam.pdf In PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/datosumuruvuwurutopugu.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109141742523699.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/73541102467.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/5nmo1tabprhs9ogu5202setij5/22548308506.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/12929933915.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kekibibatunapisiv.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/jurudadegiz.pdfIn PDF document text
    • https://atiksigorta.com/files/84278673489.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/43286608936.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/161406a02c637e---53711299622.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/zaridi.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/nuvorateguzesufines.pdfIn PDF document text
    • http://khlongtoei-nfe.com/library/userfiles/files/22949711869.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/xowadinolujevowaxopate.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091713433_523140403.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/17919249987.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/forotubabovidil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gallery+photo+lock+app+downloadPDF 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_off0000ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9A 10680 bytes
SHA-256: 92aff786c63750b453d3e5e10c5463699e071b48e795e2478e1b9e1049b81e8d
font_01_sfnt_off0000c52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3E 16592 bytes
SHA-256: d5b1147480d0efe7e9a49851425e6f53cc356204fa8b227ea8ce367cd0a801b1

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