Malicious PDF — malware analysis report

Static analysis result for SHA-256 9408eba96c73fcfb…

MALICIOUS

PDF

69.7 KB Created: 2021-09-30 19:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76ef2a34d8a6f44f2da19ae029eaa948 SHA-1: 90644d4fe651d19fc6c6da9438432e682ef573be SHA-256: 9408eba96c73fcfb626deb60182c04ef02b1573c48b222fe9812b375efcfb412
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a likely attempt to redirect users to malicious sites. The ML classifier strongly suggests malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 4

  • 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://jogagongu.pl/userfiles/file/27782550503.pdf
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/dutijakafelopoxititer.pdf
    • https://majubesar.net/contents/files/71079509001.pdf
    • https://www.mds-horizons.com/upload/files/62317851303.pdf
    • http://vizugy.hu/uploads/files/files/tatikixigusadajakev.pdf
    • http://hilimall.ae/uploads/files/89904987297.pdf
    • https://corpus.bg/files/fck/file/8399326407.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/8221b9c5e0dbd1ffc7b2c1b8c9c9d074/97903746446.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/857f2bb3b18bea1ce572b5becb14a4bb/jugetaxujujudupimurixobu.pdf
    • https://ls-machinery.com/uploadpic/files/202109200638028597.pdf
    • http://windowsplusllc.com/ckfinder/userfiles/files/40586190932.pdf
    • http://sevvalturizm.com/rsm/files/japofam.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/dilavisuwukakome.pdf
    • https://avukatwebsitesi.trakyasoft.com/upload/files/71591595703.pdf
    • http://kqcme.yiaiwang.com.cn/upload/files/52466034147.pdf
    • http://mcutech.net/upload/2021/09/file/1632470113163974121.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/kusizemekaget.pdf
    • https://crownprolaw.cn/userfiles/Proj_Name/files/25697082959.pdf
    • http://fmmvn.net/userfiles/files/68569191653.pdf
    • https://atpl.aero/ckfinder/userfiles/files/sosadipafima.pdf
    • https://linhngapt.vn/upload/files/36239926589.pdf
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/ritawir.pdf
    • https://marlschuz.com/userfiles/files/91867211341.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=need+for+speed+payback+play+store
    • https://www.thc.gda.pl/ckfinder/userfiles/files/duvekegivo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF95 16792 bytes
font_01_sfnt_off0000c7a7.bin
22bb5cfbd2c5f1a1ec17d4caf0edc8cee1ec97e7138a6d7f1fdeaa670983eac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 15980 bytes
font_02_sfnt_off0000f09d.bin
030bfc4109202577038f98c2d47d4a3aea18b838160677c66dee3dd208033fda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 10740 bytes

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