Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4b84d4af6d218c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 00:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d11e0c31fb015efc56aeeb6956782004 SHA-1: 3282f8d8456a894da8e7deaa1e37689806821950 SHA-256: fd4b84d4af6d218c80567fabb24d4ca7ca4cb9d599a4f45f5957e81e27d2efa0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The PDF acts as a link farm, embedding numerous URLs that point to other PDF files, likely serving as a lure for users to download potentially unwanted or malicious software. The presence of external URI links and the overall structure suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://skupka23.ru/upload/m/33220521682.pdf In PDF document text
    • http://dekobonner.de/userfiles/file/3250546861.pdfIn PDF document text
    • http://state-lithium.com/upload/files/31146584881.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/66093519188.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/jawudalo.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/24943025433.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/23713720454.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/64463425045.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/91618341760.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/gameluj.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/32816115989.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///45950302848.pdfIn PDF document text
    • https://okazionche.com/files/budeze.pdfIn PDF document text
    • https://crv.dascalita.ro/app/webroot/files/userfiles/files/fevediretulisuk.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/zisexabigosuw.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/novoxerurojenefovirufi.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/jadox.pdfIn PDF document text
    • http://momsystem.ru/public/file/59401176002.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///detisutonejuvilexojes.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/kazusowe.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e4f3aa636c9e193c898458f7e2da14c0/debitexemide.pdfIn PDF document text
    • https://educhina.mn/editor/files/44609613716.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/96138762290.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=puzzle+combat+apk+modPDF 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 10604 bytes
SHA-256: f3f3ea1e79efcab2fb05aa71058f682a8344ffb59d78f2df97fc29fb8520c74c
font_02_sfnt_off00010538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10538 18568 bytes
SHA-256: a2b3f5bd48955749513ac6cfca18f1257196997604be39a215e7c5bcc8ef5a5d

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