Malicious PDF — malware analysis report

Static analysis result for SHA-256 622ba3fbe7cd706e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-14 00:18:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 935c0a93386dd276b7ca4f21ab3352ef SHA-1: 395bc4dd3a36410452478383b7258da4bfa821fb SHA-256: 622ba3fbe7cd706ebfd31fd6899061b7b6d313af6d82e59588893759ed444ee4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to other PDF files hosted on various domains, indicative of a link farm designed to obscure the true malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure that would typically lead to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138a51fdd847---fofifi.pdf In PDF document text
    • http://anael.fr/fckeditor/userfiles/file/mobifaf.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/94243919017.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/86268783093.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/mivepinubupegawutaj.pdfIn PDF document text
    • https://tekartltd.com/upload/files/82021851258.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78489475560.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/60249901702.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/85279131941.pdfIn PDF document text
    • https://mauspro.net/upload/files/xepigegurub.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xedefidadowisajenexawezi.pdfIn PDF document text
    • http://keitbg.com/images/files/45471215203.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/nejidodiz.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130afceb1190---venuzowir.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/porosumiwedelilobepa.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/32367978857.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/wakakaxilenodulojajukediz.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/66825038259.pdfIn PDF document text
    • https://conrays.ru/f/data/mabisu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/29a54403641be5ae691f3df96d1ec9ac/fojim.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/dedulepipotariz.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/34769540877.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/jagegikoliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=minecraft+free+download+android+latest+versionPDF 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_off0000b993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB993 16104 bytes
SHA-256: f8d8a7d402508a6124ab9fb3cb16afb60b4851da10a6cf81006189e7285438ae
font_01_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 10612 bytes
SHA-256: 0930eac22a4b091032ece6eff7ed816a52b5c0a6917ebb35d67646159e7e9ff8
font_02_sfnt_off0000fb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1