Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5883bc4e405f9a9…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 07:24:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf8b50718f177b286aabe5cb95eb402a SHA-1: 76952ba666565a778c7231a4c73f686a1e0dad81 SHA-256: f5883bc4e405f9a9a45240f86e897a299fe080a441913e92e720983d6a3b4e62
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://awfiowv.love-mrt.com/upload/files/ziferepuju.pdf In PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/42786134483.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16135e49f9175b---47357644853.pdfIn PDF document text
    • https://milorem-service.ru/userfiles/file/18164416619.pdfIn PDF document text
    • http://lycee-elm.info/userfiles/file/31827699756.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/92891911594.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/23888327786.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358c2337719---jorovetefopumodep.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/parizusufetajifajajug.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/36683850923.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/88419682385.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/fusinumitufajebigavu.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/84618843416.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/texagenoru.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/34749306717.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13229358817.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/konikozorobigotesizukulo.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210909025931.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/6971905009.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/39077294130.pdfIn PDF document text
    • http://daivupaint.com/img-chamthi/files/vegojexi.pdfIn PDF document text
    • https://webaprint.be/img/file/38455097983.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/mevif.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/kesimaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+install+android+apps+using+pcPDF 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_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 17304 bytes
SHA-256: 8f2967ed1b9c05499e3aa89642e66ee6133869a94c4865481d463b3254b75283
font_01_sfnt_off00010391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 10732 bytes
SHA-256: afa8ee7d658c04111dea87044920ca577b50fc9c0e5404af2063e41549d2c8d2