Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44652e49e29a8ad…

MALICIOUS

PDF

81.0 KB Created: 2021-10-24 07:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ba3e08267350a4e71580a3219c25fed SHA-1: e6dfc8707aca361a3a8fe33dc1a2a152cdd55fe9 SHA-256: d44652e49e29a8add1f8b69938d854757a922927dfa1268a8258f80d01e647ae
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to domains that appear to be part of a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF is designed to distribute links across many disposable hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://insfilings.com/skyzone_classic/upload/files/44228844327.pdf In PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/folebonumu.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/d5eaa25c03c993ff2b610fa122fe7664/tutasalelawusewedi.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/woxamagixo.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/dugolufalodevunige.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/tuveragabipabunopuzu.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021091302274815.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/wemiragorurowolikubi.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/kupib.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/38410229145.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/47023178896.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/66933936180.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/17434993589.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/jaforegu.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/44942039709.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/losipinunenugafuxugatafof.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/88491329095.pdfIn PDF document text
    • https://e-room.co/userfiles/file/risasuvemufi.pdfIn PDF document text
    • http://kodemari.info/data/files/11635667588.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/bukede.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/kojurumugalexizimip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/6Zflnl449io/uplcv?utm_term=how+to+recover+deleted+history+on+google+chrome+macPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 17040 bytes
SHA-256: cbcdeb97e0c9678ff18e0bd2a5bd7740ee044daaf467d1195d84279ea19bfd52
font_01_sfnt_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 11076 bytes
SHA-256: 0b6ff56c2f64b0d500993e2201d3b75d1f37228765c476559a9adf5f1147ded4

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