Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2ed1e0045df409…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 06:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 071d45faf4bd57b54801671467d345a2 SHA-1: 7df84b2c9425e224af7259ee1aa7adb30c88fe65 SHA-256: ba2ed1e0045df4093f9491062cff8428ed4abca078392904b921e5097327a463
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to malicious websites or download further payloads. The PDF's structure and the presence of many disposable links point towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=advantages+of+using+android+studio PDF link annotation
    • http://hyunbulsa.org/~ewedd2/userfiles/file/javipoposujasev.pdfIn PDF document text
    • https://parfumzone.ro/files/file/91745360400.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/kelesudibamigumokovipe.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/8899128093.pdfIn PDF document text
    • http://htygroup.com/upload/files/biwasilulunekuzo.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/19709266636.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/50739600426.pdfIn PDF document text
    • http://dsfly.com/uploads/files/74430866290.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/89069389435.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/69456955421.pdfIn PDF document text
    • https://seger.cz/userfiles/file/4584753074.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0926232001631369060.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/burejedotiladij.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/japutinos.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/fofitadenosoduwobibenarud.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a27fe9aff2---gowewofuxaxokemi.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/zekagomu.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/27763544838.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/71772482095.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/89754221293.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/25652997457.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/99109257195.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/68132413724.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_off0000d8bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BF 16724 bytes
SHA-256: 132ebf7d5ffb56b24406e8a33206e7ffb98f3d07572a063f8faf1bf0e18b3f78
font_01_sfnt_off0001041c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 10632 bytes
SHA-256: d86fd09a2fde7653d93a1158290c419ec8b64e3b782207caa964d9f93905df2a

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