Malicious PDF — malware analysis report

Static analysis result for SHA-256 707d59df7d99ff81…

MALICIOUS

PDF

82.1 KB Created: 2021-09-13 01:26:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d94965485f568d7df667c1cfe299b1b9 SHA-1: 77121caa8d3c7b215019530e2fc5b3444313aad2 SHA-256: 707d59df7d99ff81ec78796ae3c58d0f176f7cb3e6ab642afb70cca82f95eec6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm, a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://sungwoneng.com/upfile_editor/2021/files/1370747933.pdf In PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/99747871639.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/83985473027.pdfIn PDF document text
    • http://learningkey.org/userfiles/81512322654.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210902202620.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/89095481646.pdfIn PDF document text
    • http://cyuansheng.com/userfiles/file/13339226531.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/770963c5a9f2174de1a8f3bd59f462f7/xomazi.pdfIn PDF document text
    • http://juha.be/_files/file/87734992689.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/98316660598.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133e9fa09233---24520326396.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/solixipijifogapokewipudis.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/wekulegenuwosikanewose.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/99925440979.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/boposetitotowixujixav.pdfIn PDF document text
    • https://pellevah.com/upload/files/melilaretobixowolasob.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/resedo.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/zopanaxevuzagode.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/toxavuwob.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/44967508422.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/28308260948.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/tisuralemipajaxuparositus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=low+poly+papercraft+pdf+freePDF 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_off0000dc37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF449 17980 bytes
SHA-256: 3e3eefe469ad6fea0c45989ee0493608ce67c75dd8370b45d59a43190973f114
font_02_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 10404 bytes
SHA-256: 34df2fb4629826089da3698e2645e7a844110b0512b16df41a1971c3420aba51

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