Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91cdb5057cebf85…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 11:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a1dfa5106dc278d5412a44568e93a3ce SHA-1: ac51b42677c5d9d19c933f70533d2366607ffbee SHA-256: e91cdb5057cebf85d9333b324ef050e380c180f77556d4760ec93f6814a6714f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which are hosted on disposable domains or are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the structure and heuristics point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://iword.de/userfiles/file/nunubudepevitokivuzafutin.pdf In PDF document text
    • http://bankerz.in/qpic/files/zabexubidepekuruv.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/33530345058.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/851067150.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/merapipev.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/vamipi.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4dba1c31d056da06dab4b981b021cb7e/nafadanulatedora.pdfIn PDF document text
    • http://mediaworld.pro/ckfinder/userfiles/files/71576727704.pdfIn PDF document text
    • https://siroyensao.com/upload/files/29561819592.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/kalunekofebisomoti.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/mopubapowinaterugu.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/vodufaxunuxubigim.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/zugunudufos.pdfIn PDF document text
    • http://salwex.hu/file/60852253408.pdfIn PDF document text
    • https://heyratacademy.ir/file/16408744997.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/muwamubevexe.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/72699441050.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/68258569030.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ludima.pdfIn PDF document text
    • http://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/migizusimofiweximo.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/52687284561.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/13770700444.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/tolorukijedepufasutob.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/texedimudozizisadivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sky+sports+news+live+stream+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4d3fce2f84493c00844a3f5d22e80f80/92926727545.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 10984 bytes
SHA-256: 78b45bad29a20fd377810b7adad45809d6cd0ba9c69726c5b2d9a44125b45b77
font_01_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E02 17476 bytes
SHA-256: 1a26b87af2cae22ad0f150808aa0e6e9cdb03c6c41be1f4ccf9a90673dde399e