Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9211ac452cb595b…

MALICIOUS

PDF

84.1 KB Created: 2021-03-10 02:14:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32432c9d3545a2232cc97b65e695665f SHA-1: a1faf08380af44a44e176d613dc5e6cdb152c5e0 SHA-256: b9211ac452cb595be2ac928613a2b2e03d2ba39086b664f4c2f13df812fd390d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file exhibits characteristics of a link farm, containing a large number of external links, many pointing to disposable hosting. One critical heuristic indicates a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://crophysi.ru/award?keyword=les+adjectifs+possessifs+exercices+a1+pdf In PDF document text
    • https://cdn.sqhk.co/divutugim/hchanlO/super_fowlst_2_mod_apk.pdfIn PDF document text
    • http://sitizinudex.getenjoyment.net/jeloloxusire.pdfIn PDF document text
    • http://kedejivebirago.iblogger.org/sukisalobotibukadiwuniviz.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/fjeigTy/flower_power_garden_centre_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/gelowidabik/icjcrzO/cosmos_pizza_boulder.pdfIn PDF document text
    • https://cdn.sqhk.co/gadakoferupa/ajgbCid/waze_traffic_app_toronto.pdfIn PDF document text
    • http://mavigawika.scienceontheweb.net/59605028584.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxovunevo/iSjghbD/soriguwajekewibisiropakog.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/J0id2KB/jordan_snakeskin_11_pink_shirt.pdfIn PDF document text
    • https://cdn.sqhk.co/xarazoxege/AHijBuW/chrome_resume_after_network_error.pdfIn PDF document text
    • http://luxasireku.sportsontheweb.net/norelco_multigroom_5000_vs_7000.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/5gjgdNx/search_inside_yourself_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kuxoxokazutuv.myartsonline.com/butodisekizomegalapixiben.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/ffiv_after_years_guide.pdfIn PDF document text
    • https://8fa10226-37c2-454d-bd65-ced70ecbf0c4.filesusr.com/ugd/c34aa9_acfc4204c3f84146b28f6b9117a716ab.pdf?index=trueIn PDF document text
    • http://gawejufabobepi.epizy.com/terolezufujasapalujezijof.pdfIn PDF document text
    • http://rijonitapadon.myartsonline.com/principales_funciones_del_jefe_de_recursos_humanos.pdfIn PDF document text
    • http://loxosufodu.epizy.com/xubibikaxarafafajajo.pdfIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_ec45d37e969b4621a16b22234ac87340.pdf?index=trueIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_8f60d0ca19f84955b9405a611333c374.pdf?index=trueIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_66c639e7fd464022bb0cd9fcb664ea83.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/kiboxojutusosomaxo.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 5256 bytes
SHA-256: 1bc561c280c361ed5da0239f43c5ae2519d50a02842572f6727cdb35ea6c9240
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 2884 bytes
SHA-256: b17c878e4389bc37131d23314004e051637468a2b9b6171fd873bbdc24766b0c
font_02_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 12480 bytes
SHA-256: ded83affa000b82be97e64ddbba60094ce0d11797da7962e1b96d55ae48c3baf
font_03_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16280 bytes
SHA-256: 0269ef721f5359e669c8b583512dd90e7138d6cd6b544544f968629d091ba9b2