Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcd43a083de52ac6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 11:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 049a3618d273861b448d734ba461932f SHA-1: 739f8356926f0e26d756376e431592bd1df247d8 SHA-256: bcd43a083de52ac67c117e9c7ec4eff27d26879f0e38e1dc72a04b76edcf8c22
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by an ML classifier as malicious and contains numerous embedded URLs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to manipulate search engine results or redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URIs and the ML classification strongly suggest malicious intent, possibly involving redirection to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://oniceh.ru/uplcv?utm_term=pokemon+go+spoofing+apk+2020 PDF link annotation
    • http://mya1fc.com/files/ckuploads/files/gabetetepakijuni.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191613825336.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/73188690528.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/90403311680.pdfIn PDF document text
    • http://rsst77.ru/upload/files/70375304084.pdfIn PDF document text
    • https://masukpt1.com/contents/files/vusofax.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210908_005557_141.pdfIn PDF document text
    • http://imaginove.eu/data/Files/nodijemefobine.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/pomaxijokomigilejotot.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/88462654960.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/83430491763.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/20915718456.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/xezagugafaketat.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48c507c9e---86774233997.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/97001126612.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/selexe.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/bojikoxonotu.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109170551264491.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/46588665484.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/63015564126.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/mibilijizasu.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/df401f772a39a8c871f72aff4174cd4f/naruguxekerumumininuv.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/9890401364.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/tinilidi.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_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 18484 bytes
SHA-256: 8c2ceab8cb5394129224aac7395d2dc53e3a38754eed06bdd07b6131f11dc9e5
font_01_sfnt_off00010c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4E 10792 bytes
SHA-256: 168165d2ced711335392741a7e655aeade037da7acad6c6c0b12174d56ce8e97
font_02_sfnt_off0001253c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1