Malicious PDF — malware analysis report

Static analysis result for SHA-256 0804c27478b6ddb8…

MALICIOUS

PDF

84.9 KB Created: 2021-09-20 00:50:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7f04a134e55ec4dc44a0d8363b0b079 SHA-1: d92d6b77dad210c4126808f858cea3a8e54b0337 SHA-256: 0804c27478b6ddb8cb61aa8bbcfcc0980006a1fdef173e2f36fcd65f3e95b464
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of a link farm with numerous disposable hosting links suggests an attempt to distribute malicious files or conduct phishing. The document body was unreadable, but the heuristics point towards a malicious PDF designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://piphoto.tw/uploads/files/202109112127472220.pdf In PDF document text
    • http://hueide.com/upload/files/71540255109.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161456be7457a7---sinosepuguruv.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/xosusevutoxoxijovujopemi.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/72959786569.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/92338518281.pdfIn PDF document text
    • https://drlalashow.com/php/billboard/uploads/file/towulobokapelakusexowise.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/71917697159.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/5982248309.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/ripefatizopekazogubuz.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/19229118756.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/ropolofodumezugowelemaje.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/juzija.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/4197350581.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4m50kafk82q370crjvpafvuq41/81616959697.pdfIn PDF document text
    • http://fitviewer.de/files/file/buxixugudobum.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/70790050202.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/vurodugitividelawozu.pdfIn PDF document text
    • http://lakesnwoodskerala.com/uploads/file/jazojipi.pdfIn PDF document text
    • http://hasyo.net/files/file/1743319852.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/mifutiropurane.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/pagazibujalorek.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jadenisafugepo.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/sereb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=dual+space+app+apk+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_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10496 bytes
SHA-256: a6d084d23bdb05d1f971cb7f68d0c3e1a6af94d8cdad3b28c1ead3a48bfa5f6a
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001160d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160D 18236 bytes
SHA-256: 2905219711dd96d3f28857b967e468430e3201b5ef910781e0382e22a65890a8