Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc700ac833dc26a…

MALICIOUS

PDF

82.7 KB Created: 2021-09-21 21:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 693fcc6069b050cfa3588500ced3cacd SHA-1: 02219d7677c3fe37254dee4fe12dc8b362a2069f SHA-256: 1dc700ac833dc26aedb8b6798a40bbab2de15a91dfe404a7927a9cdf1b1073b1
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged as malicious by an ML classifier with high confidence. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://diakmelo.hu/ckfinder/userfiles/files/82488103039.pdf
    • http://vinmexindia.com/uploads/84607992505.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb7865413---xokewujopulo.pdf
    • http://xn--80aesyq.xn--p1acf/files/file/lisasosawopumukatel.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/60s5c8ir9vejn6e8fg8bbbgcqk/49458002283.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210907182055.pdf
    • http://skene.es/userfiles/file/96082474058.pdf
    • https://ipekyolumedya.com/resim_galeri/file/74739727025.pdf
    • http://ackerviewguesthouse.com/userfiles/file/nodovarejozumaxorew.pdf
    • http://aliguoriarchitetto.eu/userfiles/files/88087895584.pdf
    • https://hot-pol.com/images/file/ziwiwekamidax.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/63493220399.pdf
    • https://divetechmarine.com/contents/files/xozibakusepoturiwurap.pdf
    • http://cancunday.com/travela/img/files/94231333638.pdf
    • https://ixiu-23.com/uploads/files/202109120334272263.pdf
    • https://osikovo.eu/webroot/img/content/files/pirosizek.pdf
    • http://romanasulcikova.cz/userfiles/niwexomezugazuwolur.pdf
    • http://vo23.ru/upload/file/jujagon.pdf
    • https://afmiletisim.com/resimler/files/xejajatofunebugobosegoket.pdf
    • http://ziva-muzika.cz/files/file/nogasenotezudupozi.pdf
    • http://jingkangchem.com/upload/files/nilijigisusirupi.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d12228d08c---dunani.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=airplay+dlna+receiver+apk
    • 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_off0000d7b6.bin
8f0210b53d1d50794ceec7f5be3658c1c1a7c2d8edb244c702af8c55fccb4fa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B6 20872 bytes
font_01_sfnt_off00010e3f.bin
2f6b812208aae2e88290958da30e5699083b91901ee99c59ccdd762b6403f4a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 10372 bytes
font_02_sfnt_off000125c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16792 bytes

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