Malicious PDF — malware analysis report

Static analysis result for SHA-256 b710dcb30b86984b…

MALICIOUS

PDF

67.8 KB Created: 2021-09-29 08:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f2f6eaf5dcf6430677036d0dd623327 SHA-1: a8f1c46709066aae216ea43962761163b76f6876 SHA-256: b710dcb30b86984b550afe8af29830c5368d372c7d56507c348fc82428d1c11e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The PDF contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=hbr+review+pdf PDF link annotation
    • http://toeicspeaking.net/_UploadFile/Images/file/mejemudepovozezozumakof.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/15458544220.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/40834545483.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/puwedot.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/23920760483.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109231938333073.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/56441462269.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/65903231740.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/58866926943.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/magajezofidajukobawovoxot.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/somemawosubezugotedija.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/tapaputowenufu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q0sqdnj5tc729q0rfppk73fngc/64296176871.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/gabizomulovigavoxol.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/72227014344.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/4091121690.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/36185756969.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/bubefuzu.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/suganorizu.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/zavusogomepajetevim.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/37976218912.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140d5313edfc---basafev.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://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_off0000adb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB7 10076 bytes
SHA-256: 444426d903cbcfa782ad9760c84670fd767b4bb1b81e1888d056cf6f88edc68d
font_01_sfnt_off0000c401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC401 15008 bytes
SHA-256: bde41efca9e744f7125de8be000f2f53793966fdf75372577dfd785886033289
font_02_sfnt_off0000e9e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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