Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cc1de1804bb9ea4…

MALICIOUS

PDF

89.9 KB Created: 2021-09-20 18:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aaec60d418d4e3cc05f5ee3107077549 SHA-1: 3806265624f5f3d3e4b4e19166f4b7528ca0b41f SHA-256: 9cc1de1804bb9ea45b3b10013dafe095055e04cfb22b24f48f9b5f5ebd0833d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, commonly associated with phishing or malware distribution campaigns. No scripts were extracted, but the presence of external links strongly implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://smidgel.ru/uplcv?utm_term=fotografia+forense+criminalistica+pdf PDF link annotation
    • http://thepnguyentran.com/media/ftp/file/71079426160.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/6176492136.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/82901758984.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/17994367110.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/wawojoji.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/fezumesa.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/kaliduvezugireka.pdfIn PDF document text
    • http://africareview.in/userfiles/file/81803612511.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/jawoxalizolobaw.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/sogewirova.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/45223908544.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/fupuxuxozikigasotedevevu.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/27048967420.pdfIn PDF document text
    • http://lmalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kagejigubawadazori.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gojozuruda.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/42517111029.pdfIn PDF document text
    • https://mlspoland.co/files/file/58711795651.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133637bd02a4---97649205114.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/85429153944.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210914_EE48C68E0BCF048B.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/wifagefegovomeruzapez.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/85879688871.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/megipupigowugivenigapage.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/tazesidowud.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_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 10940 bytes
SHA-256: f5876a60641956a1fe47757ff996d68fba2146c54d847425213209bfc4f93b91
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 18644 bytes
SHA-256: 712818f99bcf4b026966260534794a1fd10189d871df0a70cb5ced24920764c3

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