Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a5e28844b888cd…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 02:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b23db6c8a2143720ba39c48144fd691 SHA-1: 0bbc2298f82c2b0604d24a0ea4d08db1d5a7a44e SHA-256: b6a5e28844b888cdf0821206a2204bfd194597ffa32c1629d6331db80720ba65
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically flagged as a potential redirector. The ML classifier strongly indicates malicious intent. The presence of JavaScript suggests an attempt to execute code, likely to redirect the user to a malicious site or download a payload. The document's structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://allytemp.ru/uplcv?utm_term=free+tamil+live+tv+apk+2020 PDF link annotation
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613931fb7eec2---69140638815.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/72158683434.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/32830466948.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/redodobedujikalox.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/benesesilabori.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/70250551395.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/wabenavewugopesix.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/87329168712.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/78620227898.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/foferopi.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/pitopakifojuzakezikaj.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/tojurazosinexizawamatima.pdfIn PDF document text
    • http://tai-group.com/upload/files/78380240650.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/valifajanunegu.pdfIn PDF document text
    • http://novichiha.ru/pic/file/bifido.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/49482207468.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/josotesilejuga.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e2ffddee377454782dacf3807b817fad/pidut.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/lerotubejoxujesina.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/10694295310.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/bamisowefexanimulozoguteb.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/magogenopefurajixufalogo.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/daxokafisilejolewafunosu.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109191820579752.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://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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 18272 bytes
SHA-256: 5790154d6f2c19697e7291893a13123512f6a2853bb02c7bdb13394518e8431b
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10396 bytes
SHA-256: aa247b0cd8248a7314a41e24174ad4cb0c5a0f28e151999611d86cd7da03fab4

Open this report in the interactive analyzer, or submit your own file for analysis.