Malicious PDF — malware analysis report

Static analysis result for SHA-256 435088ad35b7fdbf…

MALICIOUS

PDF

69.9 KB Created: 2021-09-29 10:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 74b1c660f1f86671c722eb0f44931a3b SHA-1: f5943159101da26b0be895042d6058611e6d6f1d SHA-256: 435088ad35b7fdbf381d7788019eacc8cdc56ff8986a3fd903c8659710fd7a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs pointing to a link farm, suggesting a tactic to obscure the ultimate destination or to engage in SEO poisoning. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of external links.

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://luyutea.net/v15/Upload/file/2021925517466930.pdf In PDF document text
    • http://indianamartialartsfitness.com/flash/indianamartialartsfitness.com/file/vekukoruziduxiwojusixi.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/gixul.pdfIn PDF document text
    • http://torgoborud.org/images/file/35535852773.pdfIn PDF document text
    • http://thienlongadv.com/upload/files/gateworobokuxuzof.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/xevubatux.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16142280ff3f38---37440358398.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/74952109198.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/morikalesel.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/15658717976.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/gosexaxuxetevuxukijo.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/vamimapusuwab.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/mowigalazetaxizob.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/laxakopoziverubatujax.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/movedexabaxobav.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/38240011889.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/96066438404.pdfIn PDF document text
    • http://paliukenas.lt/i/File/39552292038.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152cf3bad397---paboxumumex.pdfIn PDF document text
    • http://xn--42ci4cc0aric4a6dd7c5af9nef7sg.com/userfiles/files/62572600700.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/71125736304.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/61896456729.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/nexometusomalagunemuged.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/77405204211.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/26153516750.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=eve+online+npc+damagePDF 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_off0000b2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC2 15484 bytes
SHA-256: fba6e0df186e2c925075f8632080273d67f8c9cc3cd3f6a1301eff3baa3f08e5
font_02_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 10540 bytes
SHA-256: 467356615fd29ccee4a46008938f2e92825aefe54bfebaacad9b099f1023af2d