Malicious PDF — malware analysis report

Static analysis result for SHA-256 046c8c8d57e2fde3…

MALICIOUS

PDF

85.7 KB Created: 2021-09-13 12:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faaf1d1e05dbbb3e1d442a55d6d49871 SHA-1: d62838eab185b5f4db7927f51a68b08752c7e456 SHA-256: 046c8c8d57e2fde3e0745c47204ac3f928c45185fd2cb2f963b1b5f204db1630
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. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of multiple links on disposable hosting further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://irlanc.ru/uplcv?utm_term=download+we+were+liars+pdf PDF link annotation
    • https://rainbowfurnitures.com/files/files/46277737538.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/pudowumumosijun.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/luliwevuvufawidubejuwetiw.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/podawarafeliteladaze.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f17f46c7fc---6136604084.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/rixomonugim.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/91127590179.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/8334856775.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/30312114970.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/4758416993.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382a1bd97b7---tikokujipuwapen.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/farapixewatoma.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/togelumiziv.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/wipobe.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/kogevaximarinelatesa.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/gumukuj.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/lexiwenetoxa.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/48734863549.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/10809536719.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/zovajo.pdfIn PDF document text
    • http://vps73.juicy-group.com/editor_upload_image/file/10606390247.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/21711089961.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/wevegomunezas.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/selajewidadumal.pdfIn PDF document text
    • https://viboot.traigiongthuha.com/ckfinder/userfiles/files/belinewixixejudexetoraf.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/pifolavogaxanoja.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_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 10480 bytes
SHA-256: 5eb0449f45958a4b963c7ca7fd82f6aa6893f8918e2aa124d5e757c75125a28d
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 18276 bytes
SHA-256: 7f6c047faeff5d3e18fa65cb5972a6eabd535bb7638ad0dc2d2e4f7ba5acdda4
font_02_sfnt_off00013114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13114 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1