Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a7116261355217…

MALICIOUS

PDF

76.6 KB Created: 2021-09-16 12:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 004e56f9bca79c98bbbf9e6e121deac2 SHA-1: 24325802f5ff2d5543415c56ac26b1a52b2076ea SHA-256: 11a71162613552170b1560e846f8186b49a8366d67cb4a9e151c6eb7875092eb
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. It also features a high number of external URIs pointing to a link farm, suggesting an attempt at SEO poisoning or distributing more malicious content. The ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://h-p-n.fr/catalogue_dynamique/file/xaxebogekiku.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/5801944095.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/vuwunetani.pdfIn PDF document text
    • https://xedulichhaiphong.vn/images/news/files/13836747582.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/974nt7jpa292fvnjdv3r533vsd/11491862240.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/63467982510.pdfIn PDF document text
    • http://snft.ro/media/file/lakokazu.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/30088352132.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/55194457080.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/90276106372.pdfIn PDF document text
    • https://kaparatt.com/images/File/92170281505.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/bifojosox.pdfIn PDF document text
    • http://ned.ru/uploads/files/laxat.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/25692885806.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/filax.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/15692217637.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/77705342770.pdfIn PDF document text
    • http://k1a.ru/images/files/file/78761514809.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/bavasumomowutoriku.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/lebit.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/63517568040.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/zovakulewilim.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/41379573061379dac46571.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/21837607462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=tawakkalna+app+download+apkPDF link annotation
    • 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_off0000ca57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA57 17328 bytes
SHA-256: 91ecd72ef4f03b7024c5ed59ded26e027c1488ca556ce5edde7e7542757a5579
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 9936 bytes
SHA-256: b623e54ed9e0f37aaf34abeb932053d7235be9953233e2be3053e5b2edf99c7f
font_02_sfnt_off00010d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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