Malicious PDF — malware analysis report

Static analysis result for SHA-256 496ecf37f72c10b2…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 07:26:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4b4cdb75e817f74831a3753fb2b4cf6 SHA-1: a5bd8e98d5f7391cea7dda14aa485584ddb578f7 SHA-256: 496ecf37f72c10b23dfb789d23382b81fede26851e5f812be28127c68a6b22ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior, aiming to obscure the ultimate destination.

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 http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/97305444567.pdf In PDF document text
    • https://kapefashion.com/files/files/rafulowisabupiworuve.pdfIn PDF document text
    • http://artio.pl/files/files/polobitebowamanebosev.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7dfc9facc---legolijevofipas.pdfIn PDF document text
    • http://zenkatsu.dk/files/saxenipuvirij.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/konaneki.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381560d8b9b---kusibikazexususesina.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/dopituzimupulusuku.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/nugoxafekujiligibabesal.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/72605109100.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/juparerefuxegumal.pdfIn PDF document text
    • http://rnralpha.cz/res/file/69628293141.pdfIn PDF document text
    • http://sbairs.com/datas/files/56987198246.pdfIn PDF document text
    • https://cakkue.com/contents/files/34834585800.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/94327601237.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/efdb33b7d271b1254f155b31324ecaa7/69327281180.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/74291046075.pdfIn PDF document text
    • https://okazionche.com/files/xiperulaxulokoxixuwumu.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/fufipumotemokali.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kilutodexezuzo.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/22064572813.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/91426596107.pdfIn PDF document text
    • https://ikansambel.com/contents/files/40269766060.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/50363030590.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jonakog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=difference+between+mi+tv+and+redmi+tvPDF 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_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 18100 bytes
SHA-256: cbf28edb8ae8901984832b3c22f27c22b9f9dd8627443a53592ac30e54a2b6cd
font_01_sfnt_off00011576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D8D 10596 bytes
SHA-256: ca2f53ae12bcdae7bb3152afd0bc8db25e05de2c4475c51aab2578c06bd695d7