Malicious PDF — malware analysis report

Static analysis result for SHA-256 00da62e41512f22e…

MALICIOUS

PDF

73.1 KB Created: 2021-09-18 02:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c76ba38cabb3ef4052c5eb1624ff24e0 SHA-1: ab83b971bc766c1efb0230d565aac6e1fd1eefd6 SHA-256: 00da62e41512f22e70fa00141a85194995b02587f74fa5bf56e16dfe2f258fc5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution scheme. The PDF's structure and embedded content indicate it is designed to redirect the user to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=principles+of+marketing+philip+kotler+18th+edition+pdf PDF link annotation
    • http://ubytovna-krumlov.cz/userfiles/file/13002301006.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/33766919272.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/jigitujodadupedetonuwulir.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/mizituriponupivek.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/xokosut.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5301916412b6ed03356eab02a1ed7a55/74806159703.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/20994415557.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/dovalojofemur.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/41432704414.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/244174460.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210913151439.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/sikirakoxomi.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/nimavafapixijomukegevini.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/talovik.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161434f2bbac05---mipek.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tumudenaruvatorakiladoba.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/rikizemuwelaxafurapifab.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/moxapam.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/26275216489.pdfIn PDF document text
    • https://esvigo.com/upload/files/kepekibiki.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210917_0712ABC94F8E559F.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96324435026.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/vizefuvegiboviniwomefu.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109171615574880.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/60789784952.pdfIn PDF document text
    • 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_off0000b951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB951 11420 bytes
SHA-256: 88186941586d0272f2987b34782f6a347a63842f164e3112b0f8189d5daef5f3
font_01_sfnt_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFA 16528 bytes
SHA-256: f6fcf48f7a8518c66679fd0c4b4d8f5f88e3ecd3589c4f843d13ff75170319af