Malicious PDF — malware analysis report

Static analysis result for SHA-256 18019d7fd39a219d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-12 19:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 95cd46c854882c011826584cc621a0e8 SHA-1: 85fbd2afe14f0e04ce14aed34bd70e72e484cf7f SHA-256: 18019d7fd39a219ded85100cda885108ea8dc86d4ba072de27cb8c15adae581c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, suggesting it aims to redirect users to potentially harmful websites. The PDF structure and embedded URLs point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

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 https://huntic.ru/uplcv?utm_term=adult+live+streaming+apk PDF link annotation
    • http://sportschoolindex.nl/images/uploads/49628081252.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/71577950289.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/68043348964.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/74621438499.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133125742deb---83925686012.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/43128431277.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/kuwimezitudorikonu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/xojejolulikozuxunijajelo.pdfIn PDF document text
    • https://autoskola-scp.com/files/58577282888.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/zenakutujose.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/30322062317.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/95924594095.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/nigimufife.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/ribevekezabexulozunudo.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/66804149111.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/sibalatadipit.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/gonuwifuxazolol.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/50867611555.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/nuwojekuvaziju.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/gumemojekujubulasimi.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/32881091373.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/40041641134.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137759979992---72450978661.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/xiwuxamubujunipumokib.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/48726879925.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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 10856 bytes
SHA-256: e111ae296d24fb566c36536e399a5bbc160360ca370a055ed32751baa1be38af
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 18156 bytes
SHA-256: 4f261c7d8632defb2ee786bd92c7a591d31c1feab6e620e2ce7341512ebf8307